Ajax Browser support script

In the following code we are going to "try" three different ways to make a new XMLHttpRequest object. Every time we fail and get an error, we will catch the error and try the next a different command. If our "try" is successful then the "catch" code will not be run because it is only used when there is an error.

<html>
<body>

<script language="javascript" type="text/javascript">
<!-- 
//Browser Support Script
function ajaxFunction(){
	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something wrong
				alert("Your browser does not support!");
				return false;
			}
		}
	}
}
//-->
</script>



<form name='myForm'>
Name: <input type='text' name='username' /> <br />
Time: <input type='text' name='time' />
</form>
</body>
</html>