var offset=0;
function imgchng(element, state)
{
var source = document.getElementById(element).src;
   if(state==0)
   {
   source=source.replace("Out.png", "Over.png");
   }
   else
   {
   source=source.replace("Over.png", "Out.png");
   }
document.getElementById(element).src=source;
}