function button_over(obj, img){
    obj.src = img;
    obj.style.cursor = "pointer"
    }
    
    function button_out(obj, img){
    obj.src = img;
    }    


    function menu(form) { 
       if(form.url.selectedIndex != 0) 
          self.window.location = form.url.options[form.url.selectedIndex].value 
    }