function nextimg(img_id,img)
{
document.images[img_id].src="images/"+img;
}

function getObj(name) 
{
  if (document.getElementById) return document.getElementById(name);
  else if (document.all) return document.all[name];
  else if (document.layers) return document.layers[name];
  else return false;
}

function hidediv(img_id,doaction)
{
 obj=getObj(img_id);
 if(doaction)
  obj.style.visibility='hidden';
 else
  obj.style.visibility='visible';
}