function getXMLHttpObject() {
    var xmlHttp = null;
    try { xmlHttp=new XMLHttpRequest(); }
    catch (e) {  
	    try { xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); }
 	    catch (e) {
		    try { xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); }
		    catch (e) {}
	    }  
    }
    return xmlHttp;
}