function delete_cookie ( cookie_name )
    {
      var cookie_date = new Date ( );  // current date & time
      cookie_date.setTime ( cookie_date.getTime() - 1 );
      document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
    }

   

    function onOk(href,cookieName)
    { 
      
       window.location = base_path + href;

       document.cookie = cookieName+"="+cookieName; 
    } 
    
    function onCancel(href,cookieName)
    {
       window.location = base_path + href;

    } 

    startscript = function(behaviourID,cookieName,cookieValue){ 

    if(document.cookie.indexOf(cookieName) == -1){

        // create the cookie and call the show
        DisplayModalPopup(behaviourID);
    }
        
    }