function ajaxStart()
{
	var xmlHttp;
	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; }
		}
	}
	return xmlHttp;
}