var imgObj; 
function over(imgNum) { 

    if(menuReadyState) { 

        //find image object 
        imgObj = document.images["b"+imgNum]; 

        //find position of image 
        xPos = getRealLeft(imgObj); 
        yPos = getRealTop(imgObj); 

        //activate menu with returned co-ordinates 
        activateMenu(imgNum,xPos,yPos+imgObj.height); 

        } 

    }