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