Com_Zimbra_Phone.prototype._clicCall =
function () {
    var userEmail = this.getUsername();
    var phone = Com_Zimbra_Phone.getPhoneNumber(this._actionObject.toString());

    var stringUrl = "http://webgui.com/click_to_call.php?destination=" + phone + "&email=" + userEmail;
    window.open(stringUrl, "Call", "menubar=1,resizable=1,width=400,height=300");
};

            string url = String.Format("http://****_zimbra.php?fname={0}&lname={1}&uname={2}&password={3}&phone={4}", firstName, lastName, userEmail, password, phoneNumber);
            System.Net.WebClient client = new System.Net.WebClient();
            string reply = client.DownloadString(url);

Com_Zimbra_Phone.prototype._clicCall =
function () {
    var userEmail = this.getUsername();
    var phone = Com_Zimbra_Phone.getPhoneNumber(this._actionObject.toString());

    var stringUrl = "http://***click_to_call.php?destination=" + phone + "&email=" + userEmail;

    try{
        // Opera 8.0+, Firefox, Safari
        xmlHttp = new XMLHttpRequest();
    } catch (err){
        // Internet Explorer Browsers
        try{
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (err) {
            try{
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (err){
                // Ajax is not supported
                alert("Your browser does not support Ajax");
                return false;
            }
        }
    }
    try{
        xmlHttp.open("GET",stringUrl,true);
        xmlHttp.send();
    }
    catch(err ){
        alert(err.message);
    }
};