function IsValidUsername(txtUsername) {

           var myTxtBoxUsername = document.getElementById(txtUsername).value;
            wPageMethods.IsValidUsernameSvc(myTxtBoxUsername, CallSuccess, CallFailed)
    }

    function CallSuccess(res) {

        document.getElementById('usernamevalidationresult').innerHTML = res;
    }

    // alert message on some failure
    function CallFailed(res) {
        alert(res.get_message());
    }

    var t1;
    function showDetails(e, custId,PageURL) {
        var url = PageURL; 
        var qstr = 'CustID=' + custId + "&ms=" + new Date().getTime();

        var req = new Ajax.Request(
			url,
			{
			    method: 'get',
			    parameters: qstr,
			    onComplete: showTooltip
			});
        if (t1) t1.Show(e, "<br><br>Loading...");
    }

    function showTooltip(res) {
        var t = res.responseText;
        t1.SetHTML(t);
    }


    function hideTooltip(e) {
        if (t1) t1.Hide(e);
    }

    function init() {
        t1 = new ToolTip("a", true, 40);
    }
    Event.observe(window, 'load', init, false);