var xmlHttp;

function getXMLHttp()
{  
	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;        
			}      
		}    
	}
	
}