var XmlHttp = false;
if(window.XMLHttpRequest) {
	try {
		XmlHttp = new XMLHttpRequest();
  } catch(e) {
		XmlHttp = false;
  }			
} else if(window.ActiveXObject) {
 	try {
  	XmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
  	try {
    		XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  	} catch(e) {
    		XmlHttp = false;
  	}
	}
}