var xmlHttp;
function ajaxFunction()
{
	try{  
		// Firefox, Opera 8.0+, Safari  
		xmlHttp=new XMLHttpRequest();  
	}catch (e){  
		// Internet Explorer  
		try{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");    
		}catch (e){    
			try{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");      
			}catch (e){      
				alert("Your browser does not support AJAX!");      
				return false;      
			}
		}
	}
}