/**
 * This function builds and handles the XmlHttpObject that is used for the AJAX request
 */
function getXmlHttp(handler) { 
	var objXmlHttp = null;
	if (navigator.userAgent.indexOf("MSIE") >= 0) { 
		var strName = "Msxml2.XMLHTTP"
		if (navigator.appVersion.indexOf("MSIE 5.5") >= 0) {
			strName = "Microsoft.XMLHTTP";
		} 
		objXmlHttp = new ActiveXObject(strName);
		objXmlHttp.onreadystatechange = handler; 
	}
	else if (navigator.userAgent.indexOf("Mozilla") >= 0) {
		objXmlHttp = new XMLHttpRequest();
		objXmlHttp.onload = handler;
		objXmlHttp.onerror = handler; 
	}
	
	return objXmlHttp;
}