var time_out = 5000;
function image_start()
{
window.dianhua.style.visibility="visible";
window.dianhua2.style.visibility="visible";
window.setTimeout( "end_start()", time_out ); 
return false;
}
function end_start()
{
window.dianhua.style.display="none";
window.dianhua2.style.display="none";
}