if(document.images) {
  var imgs = new Array();
  imgs[0] = new Image();  imgs[0].src = "../../imgs/close_out.gif"; //
  imgs[1] = new Image();  imgs[1].src = "../../imgs/close_on.gif";
  imgs[2] = new Image();  imgs[2].src = "../../imgs/c2_out.gif";
  imgs[3] = new Image();  imgs[3].src = "../../imgs/c2_on.gif";
}

function chgimg(id, imgname) {
  if(document.images) {
   if(imgs[imgname]) {
     document.images[id].src = imgs[imgname].src;
   }else {document.images[id].src = imgname;}}}