function gallery_img_over(theId) {
  if (document.images) {
    document["img_"+theId].src = "layout/images/gal_image_"+theId+"_over.gif";
  }
}
function gallery_img_up(theId) {
  if (document.images) {
	  document["img_"+theId].src = "layout/images/gal_image_"+theId+"_on.gif";
  }
}