ret = new Image();
	ret.src = "ret2.gif";
	ret2 = new Image();
	ret2.src = "ret.gif";

function imageon(myname) 
 {
  imgOn = eval(myname + ".src"); 
  document[myname].src = imgOn; 
 } 
function imageoff(myname) 
	{ 
	  imgOff = eval(myname + "2.src"); 
	  document[myname].src = imgOff; 
}