weburl is not getting called in Crome

xmlHttpObject.open("GET", webUrl, false);

Javascript Code

function ajaxunlockrefno(refno, comp) {
    var webUrl = 'ajaxdelete.aspx?RefNo=' + refno + '&Comp=' + comp;

    var xmlHttpObject = null;
    try {
        xmlHttpObject = new XMLHttpRequest();
    } catch (ex) {
        try {
            xmlHttpObject = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (ex) {
            xmlHttpObject = new ActiveXObject('Microsoft.XMLHTTP');
        }
    }
    if (xmlHttpObject == null) {
        window.alert('AJAX is not available in this browser');
        return;
    }

    xmlHttpObject.open("GET", webUrl, false);
    xmlHttpObject.send();
}