function navDreieck()
{
            if (showDreieck) 
            {    
                subObj = document.getElementById("subMenuHoverActive");
                subObj.previousSibling.style.backgroundColor='#333';
                subObj.nextSibling.style.backgroundColor='#333';
            
                if (navigator.appName == 'Netscape') 
                {
                  mainPosDreieck = mainObj.offsetLeft + mainObj.offsetWidth / 2 - 4;
                  subPosDreieck = subObj.offsetLeft + subObj.offsetWidth / 2 - 4;
                }
                else
                {
                   mainPosDreieck = mainObj.offsetLeft + mainObj.offsetWidth / 2 - 4;
                   subPosDreieck = subObj.offsetLeft + subObj.offsetWidth / 2 - 4;
                }   
                document.getElementById("mainDreieck").style.left=mainPosDreieck + "px";
                document.getElementById("mainDreieck").style.visibility = "visible";

                document.getElementById("subDreieck").style.left=subPosDreieck + "px";
                document.getElementById("subDreieck").style.visibility = "visible";
            }
}