var req;
var okMsg = "true";
var nullMsg = "null";
function initRequest(url, callBack) {
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        isIE = true;
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    req.onreadystatechange = callBack;
    req.open("GET", url, true); 
    req.send(null);
}
function canProcess() {
    if (req.readyState == 4) {
        if (req.status == 200) {
        	return true;
        }
    }
    return false;
}