function rollon(iid, xid)
{
  var element = document.getElementById(iid);
  element.src = eval("imageInfo[" + xid*2 + "].src");
}
function rolloff(iid, xid)
{
  var element = document.getElementById(iid);
  element.src = eval("imageInfo[" + (xid*2+1) + "].src");   
}