var xmlHttp = false;
function getXmlHttpRequestObject()
{
	// check for native XMLHttpRequest object
	if(window.XMLHttpRequest && !(window.ActiveXObject))
	{
		try 
		{
			xmlHttp = new XMLHttpRequest();
		}
		catch(e) 
		{
			xmlHttp = false;
		}
	}
		// check for IE/Windows ActiveX version
	else if(window.ActiveXObject)
	{
		try 
		{
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			try 
			{
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) 
			{
				xmlHttp = false;
			}
		}
	}
}