// JScript File

var AjaxIsActive = false;   
        
function InvokeCallback()   
{   
    if (!AjaxIsActive)   
    {   
        AjaxIsActive = true;    
    }   
    else  
    {   
        //alert('Wait for ajax to finish');   
        return false;   
    }                   
}   
   
function CallbackComplete()   
{   
    AjaxIsActive = false;   
}