This article is given by my friend kathir. Thanks for it

Math Function

Method Function    What it Does
abs(x)            Returns the absolute value of the variable x.
cos(x)            Returns the cosine of the variable x.
log(x)            Returns the natural log of the variable x.
max(x,z)    Returns the larger of the two variables x and z.
min(x,z)    Returns the smaller of the two variables x and z.
pow(x,z)    Returns the value of the variable x to the zth power.
random()    Returns a random number between 0 and 1.
round(x)    Returns the variable x rounded to the nearest integer.
sin(x)            Returns the sine of the variable x.
sqrt(x)            Returns the square root of the variable x.
tan(x)            Returns the tangent of the variable x.

JavaScript For SplitMethod

Array in JavaScript

var quote= new Array(5)
quote[0]="I like JavaScript.";
quote[1]="I used to like Java.";
quote[2]="JavaScript rules.";
quote[3]="Help! JavaScript Error!";
quote[4]="Just Kidding.";

The SetTimeout Function

Opening And Closing  a New Window

To open a new window, you will need to use yet another ready-made JavaScript function. Here is what it looks like:
window.open('url to open','window name','attribute1,attribute2')
This is the function that allows you to open a new browser window for the viewer to use. Note that all the names and attributes are separated with a comma rather than spaces. Here is what all the stuff inside is:

1. 'url to open'
   This is the web address of the page you wish to appear in the new window.
2. 'window name'
   You can name your window whatever you like, in case you need to make a reference to the window later.
3. 'attribute1,attribute2'
   As with alot of other things, you have a choice of attributes you can adjust.

Window Attributes
Below is a list of the attributes you can use:

1. width=300
   Use this to define the width of the new window.
2. height=200
   Use this to define the height of the new window.
3. resizable=yes or no
   Use this to control whether or not you want the user to be able to resize the window.
4. scrollbars=yes or no
   This lets you decide whether or not to have scrollbars on the window.
5. toolbar=yes or no
   Whether or not the new window should have the browser navigation bar at the top (The back, foward, stop buttons..etc.).
6. location=yes or no
   Whether or not you wish to show the location box with the current url (The place to type http://address).
7. directories=yes or no
   Whether or not the window should show the extra buttons. (what's cool, personal buttons, etc...).
8. status=yes or no
   Whether or not to show the window status bar at the bottom of the window.
9. menubar=yes or no
   Whether or not to show the menus at the top of the window (File, Edit, etc...).
10. copyhistory=yes or no
    Whether or not to copy the old browser window's history list to the new window.

All right, here's an example code for opening a new window:
<FORM>
<INPUT type="button" value="New Window!" onClick="window.open('http://www.pageresource.com/jscript/jex5.htm','mywindow','width=400,height=200')">
</FORM>
Test it out below:

Yes, you got a 400 by 200 window with some writing in it!
Some Important Rules
Before we move on, we need to make note of some things so you won't go insane like I did trying to get this to work right!

1. When you get to the INPUT tag, keep everything in that tag on one single line in your text editor, including the javascript commands. (The text goes to the next line on this page so you can print it out easily).
2. Once you come to the onClick=" ", don't leave any spaces between anything. Just use the commas and the quote marks. Any white space will keep it from working correctly in Netscape.
3. Don't put quote marks around the yes, no, or numbers for the attributes. You only use single quotes around the entire set of attributes.
4. In some browsers, you may need to substitute the number 1 for yes, and the number zero for no in the attributes section. The yes or no should work fine, though.

A New Browser Window
Okay, enough rules. Let's look at the code that makes a completely new browser! Basically, you just use yes for all of the attributes. Here is the code:
<FORM>
<INPUT type="button" value="New Window!" onClick="window.open('http://www.pageresource.com/jscript/jex5.htm','mywindow','width=400,height=200,toolbar=yes,
location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,copyhistory=yes,
resizable=yes')">
</FORM>
Give it a try, this window has all the features!

Remember, keep everything on one line....one really, really long line! I just put the sample code on new lines so you wouldn't have to scroll forever to read everything........and your printer won't go crazy now either!
Closing a New Window
Hmm.....what's with the "Close Window" button you saw in the new window? How does one do do that? To use that trick, use the window.close() function in the HTML of the new window. Just put this code wherever you want the close button to show up in the new window:
<FORM>
<INPUT type="button" value="Close Window" onClick="window.close()">
</FORM>
Of course, the window can be closed with the "x" symbol on the top-right of the window as well.
Set the Window Position
There is another set of options you can use to set the position of the new window on the viewers, but it only works with NS4+ and IE4+:

1. screenX=number in pixels
   Sets the position of the window in pixels from the left of the screen in Netscape 4+.
2. screenY=number in pixels
   Sets the position of the window in pixels from the top of the screen in Netscape 4+.
3. left=number in pixels
   Sets the position of the window in pixels from the left of the screen in IE 4+.
4. top=number in pixels
   Sets the position of the window in pixels from the top of the screen in IE 4+.

Great, but how do you decide which commands to use if there are different ones for each browser? In this case, you can use both sets of commands- the browser will ignore the set it does not recognize. The example below will give you a new window 0 pixels from the left and 100 pixels from the top of your screen:
<FORM>
<INPUT type="button" value="New Window!" onClick="window.open('jex5.htm','mywindow','width=400,height=200,left=0,top=100,screenX=0,screenY=100')">
</FORM>

Now, that is a lot of work- but you can now customize a new window for your viewers!

JavaScript Browser Detection

var browserName=navigator.appName; 

if (browserName=="Netscape")

{ 

 alert("Hi Netscape User!");

}

else 

{ 

 if (browserName=="Microsoft Internet Explorer")

 {

  alert("Hi, Explorer User!");

 }

 else

  {

    alert("What ARE you browsing with here?");

   }

}

You can do the same thing with the navigator.appVersion, except you will most likely want to grab just the integer from the version information (2,3,4, etc.). To do this, we use the parseInt() function:

var browserVer=parseInt(navigator.appVersion); 

Dynamically Changing Time

Drop Down Box

String Function

JavaScript anchor Function

The anchor function can be used to wrap the string into a link anchor.
<html>
<head>
<script type="text/javascript">
         var strLinkAnchor = new String("top")
            strLinkAnchor = strLinkAnchor.anchor("top")
            document.write(strLinkAnchor)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript big Function

The big function can be used to make to string to appear in <big> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.big("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript blink Function

The blink method can be used to make the string blink. This function only works in netscape. IE doesn’t support it yet.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.blink("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript bold Function

This function is used to wrap the string into the <bold> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.bold("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript fixed Function

This function is used to wrap the string in the <TT> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.fixed("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript italics Function

This function wraps the string in the <i> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.italics("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript small Function

This function is used to wrap the string into the <small> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.small("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript strike Function

This function is used to wrap the string into the <strike> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.strike("top")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

top

JavaScript sub Function

This function is used to wrap the string in the <sub> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.sub("top")
            document.write(str)
</script>
</head>
<body>Normal Text</body>
</html>

Output

_top Normal Text

JavaScript sup Function

This function can be used to wrap the string in the <sup> tag.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.sup("top")
            document.write(str)
</script>
</head>
<body>Normal Text</body>
</html>

Output

^top Normal Text

JavaScript charAt Function

This function can be used to retrieve the character at the given index.
<html>
<head>
<script type="text/javascript">
            var str = new String("top")
            str = str.charAt(1)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

o

JavaScript charCodeAt Function

This function can be used to convert the char at the given index to the ASCII value.
<html>
<head>
<script type="text/javascript">
            var str = new String("ABC")
            str = str.charCodeAt(0)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

65

JavaScript indexOf Function

This function can be used to return the index of the given character.
<html>
<head>
<script type="text/javascript">
            var str = new String("ABC")
            str = str.indexOf("B")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

1

JavaScript lastIndexOf Function

This function can be used to return the last index of a given character.
<html>
<head>
<script type="text/javascript">
            var str = new String("ABCB")
            str = str.lastIndexOf("B")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

3

JavaScript link Function

The link method can be used to create a link with the specified string as the URL.
<html>
<head>
<script type="text/javascript">
            var str = new String("TopXML")
            str = str.link("http://www.topxml.com")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

TopXML

JavaScript concat Function

The concat function can be used to concat a string to another one.
<html>
<head>
<script type="text/javascript">
            var str = new String("Hello")
            str = str.concat(" World")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

Hello World

JavaScript fromCharCode Function

This function can be used to return a string from a number of Unicode character values. This function cannot be called with a string object, instead use String.formCharCode.
<html>
<head>
<script type="text/javascript">
            str = String.fromCharCode(65, 66, 67)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

ABC

JavaScript split Function

The split function can be used to split a string into an array of sub strings.
<html>
<head>
<script type="text/javascript">
            str = new String("0,1,2,3")
            str = str.split(",")
            document.write(str[0]+"<br/>")
            document.write(str[1]+"<br/>")
            document.write(str[2]+"<br/>")
            document.write(str[3]+"<br/>")
</script>
</head>
<body></body>
</html>

Output

0
1
2
3

JavaScript slice Function

The slice function can be used to slice a specific section and return a new string.
<html>
<head>
<script type="text/javascript">
            str = new String("Hello World")
            str = str.slice(5,11)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

World

JavaScript substring Function

The function substring can be used to get a specific section from a string. It basically works the same as the slice function.
<html>
<head>
<script type="text/javascript">
            str = new String("Hello World")
            str = str.substring(5,11)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

World

JavaScript substr Function

The function substr can be used to get a specific section from a string. It works the same as slice and substring.
<html>
<head>
<script type="text/javascript">
            str = new String("Hello World")
            str = str.substr(5,11)
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

World

JavaScript match Function

The match function can be used to match a regular expression against a string. It returns an array of the matches.
<html>
<head>
<script type="text/javascript">
            str = new String("Hello World")
            str = str.match("H")
            for(i=0;i<str.length;i++)
            {
                        document.write(str[i]+"<br/>")
            }
</script>
</head>
<body></body>
</html>

Output

H

JavaScript replace Function

The function replace can be used to replace a string with another string. A regular expression can be used to find the string.
<html>
<head>
<script type="text/javascript">
            var str = new String("Hello World")
            document.write(str+"<br/>")
            var regEx = new RegExp ('World', 'gi') ;
            str = str.replace(regEx, 'User')
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

Hello World
Hello User

JavaScript search Function

This function can be used to in conjunction with a regular expression to search for a specific format.
<html>
<head>
<script type="text/javascript">
            strWrongEmail = new String("sonu_sonu.com")
            emailRegEx = /^[^@]+@[^@]+.[a-z]{2,}$/i
            if(strWrongEmail.search(emailRegEx) == -1){
                        document.write("Email is not valid")
            }
            else
                        document.write("Email is valid")
</script>
</head>
<body></body>
</html>

Output

Email is not valid

JavaScript toLowerCase Function

This function can be used to convert the string to lower case.
<html>
<head>
<script type="text/javascript">
            str = new String("HELLO WORLD")
            str = str.toLowerCase()
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

hello world

JavaScript toUpperCase Function

This function is used to convert the string to upper case.
<html>
<head>
<script type="text/javascript">
            str = new String("hello world")
            str = str.toUpperCase()
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

HELLO WORLD

JavaScript fontcolor Function

The fontcolor function can be used to wrap the string in the <font> tag, which changes the color of the string.
<html>
<head>
<script type="text/javascript">
            str = new String("hello world")
            str = str.fontcolor("red")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

hello world

JavaScript fontsize Function

The fontsize function can be used to change the font size of the string.
<html>
<head>
<script type="text/javascript">
            str = new String("hello world")
            str = str.fontsize("12")
            document.write(str)
</script>
</head>
<body></body>
</html>

Output

hello world