// Performs AJAX call back to server
function AjaxValidatorEvaluateIsValid(val)
{
    
    var value = ValidatorGetValue(val.controltovalidate);
    
    //WebForm_DoCallback(val.id, value, AjaxValidatorResult, val, AjaxValidatorError, true);
    
    WebForm_DoCallback('ctl00:ContentPlaceHolder1:AjaxValidator1',value, AjaxValidatorResult, val, AjaxValidatorError, true);
    
    //WebForm_DoCallback('_ctl00:ContentPlaceHolder1:AjaxValidator1',params,afterCallbackFunction,before,null,false);

     
    return true;
}

// Called when result is returned from server
function AjaxValidatorResult(returnValue, context)
{
    if (returnValue == 'True')
        context.isvalid = true;
    else
        context.isvalid = false;
    ValidatorUpdateDisplay(context);
}

// If there is an error, show it
function AjaxValidatorError(message)
{
    alert('Error: ' + message);
}