function getXmlHttpObject() {

	var xmlHttp = null;

	try {
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
	
	} catch (e) {
		
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
		
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				//alert("Your browser does not support AJAX!");
				//xmlHttp = null; // already is null
			}
		}
	}
	
	return xmlHttp;
}