function getAjaxObject()
{
	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 null;
			}
		}
	}
	return xmlHttp;
}