function startAjax() {	
	var xmlHttp;	
	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!");
				return false;
			}
		}
	}
	return xmlHttp;
}