function preloadImage(src)
{
 im = new Image();
 im.src = src;
 return im;
}
function change_img(num, id, submode, mode, loc)
{
 title = document.getElementById("cardpic").firstChild.title;
 newloc = loc+mode+"/"+submode+"/"+id+"_"+num+"_m.jpg";
 _img = preloadImage(newloc);
 document.getElementById("cardpic").firstChild.href = loc+mode+"/"+submode+"/"+id+"_"+num+".jpg";
 document.getElementById("cardpic").firstChild.firstChild.src = _img.src;
 return false;
}