if (DIMG_Images == null)
  var DIMG_Images = new Array();

function DIMG_Register( id )
{
  var extpos;
  
  DIMG_Images[id] = new Object();
  DIMG_Images[id].orgsrc = document.images[id].src;
  extpos = DIMG_Images[id].orgsrc.lastIndexOf('.');
  DIMG_Images[id].swapsrc = DIMG_Images[id].orgsrc.substr(0, extpos) + '_s' + 
                            DIMG_Images[id].orgsrc.substr( extpos);
  DIMG_Images[id].realid = id;
  DIMG_Images[id].IsChanged = 0;

  /* Preload image */
  DIMG_Images[id].swap = new Image();
  DIMG_Images[id].swap.src = DIMG_Images[id].swapsrc;
}

function DIMG_RegisterByImg( id, rid, orgname, swapname )
{
  DIMG_Images[id] = new Object();
  DIMG_Images[id].orgsrc = orgname;
  DIMG_Images[id].swapsrc = swapname;
  DIMG_Images[id].realid = rid;
  DIMG_Images[id].IsChanged = 0;
}


function DIMG_Enter( id )
{
  document.images[DIMG_Images[id].realid].src = DIMG_Images[id].swapsrc;
  DIMG_Images[DIMG_Images[id].realid].IsChanged = 1;
}

function DIMG_Out( id )
{
  document.images[DIMG_Images[id].realid].src = DIMG_Images[id].orgsrc;
  DIMG_Images[DIMG_Images[id].realid].IsChanged = 0;
}