// add favorite
function handleHttpResponse() {
 if (http.readyState == 4) {
  window.alert("Added Your Favorite To Your Home Portfolio!");
 }
}
function addFavorite(myParms) {
 var listingIDValue = myParms;
 var url = "markFavorite.cgi?listing_id=";
 http.open("GET", url + listingIDValue, true);
 http.onreadystatechange = handleHttpResponse;
 http.send(null);
}

function getHTTPObject() {
 var xmlhttp = null;
 var success = false;
 // List of MS XMLHTTP versions - newest first
 var MSXML_XMLHTTP_PROGIDS = new Array(
					   'MSXML2.XMLHTTP.5.0',
					   'MSXML2.XMLHTTP.4.0',
					   'MSXML2.XMLHTTP.3.0',
					   'MSXML2.XMLHTTP',
					   'Microsoft.XMLHTTP'
					   );
 // test for IE implementations first
 for (var i = 0; i < MSXML_XMLHTTP_PROGIDS.length &&
	  !success; i++) {
	 try  {
	 xmlhttp = new ActiveXObject(MSXML_XMLHTTP_PROGIDS[i]);
	 success = true;
	 return xmlhttp;
	 }
	 catch (e) {
	 xmlhttp = false;
	 }
 }
 // Now test for non-IE implementations
 if (!xmlhttp &&
	 typeof XMLHttpRequest != 'undefined')  {
	 try {
		 xmlhttp = new XMLHttpRequest();
	 }
	 catch (e) {
		 xmlhttp = false;
	 }
 }
 return xmlhttp;
}
var http = getHTTPObject(); // We create the HTTP Object