function getXMLHttp()
{
	var xmlHttp
	try{xmlHttp = new XMLHttpRequest();}
	catch(e)
	{
		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;
}