function ajax() {
   			try {
      		xmlhttp = new XMLHttpRequest();
   			}
   			catch(ee) {
      		try {
         		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
      		}
      		catch(e) {
         		try {
         			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         		}
         		catch(E) {
          		xmlhttp = false;
         		}
      		}
   			}
   			return xmlhttp;
			}