function getXmlHttpObject(){
    var ajax=false;
    try 
	{ 
    	ajax = new ActiveXObject("Msxml2.XMLHTTP"); 
    } 
	catch (e) 
	{ 
   	 	try 
		{ 
    		ajax = new ActiveXObject("Microsoft.XMLHTTP"); 
    	} 
		catch (E) 
		{ 
    		ajax = false; 
    	} 
    }
    if (!ajax && typeof XMLHttpRequest!='undefined') 
	{ 
    	ajax = new XMLHttpRequest(); 
    } 
    return ajax;
}