function namosw_exchange_src(name, rpath, nsdoc) 
{ 
  str = (navigator.appName == 'Netscape') ? nsdoc+'.'+name : 'document.all.'+name;
  img = eval(str);
  if (img) {
    if (img.altsrc == null) {
      img.altsrc = img.src;
      img.src    = rpath;
    } else {
      var temp   = img.src;
      img.src    = img.altsrc;
      img.altsrc = temp;
    }
  } 
}

function namosw_preload_img()
{ 
  var img_list = namosw_preload_img.arguments;
  if (document.preloadlist == null) 
    document.preloadlist = new Array();
  var top = document.preloadlist.length;
  for (var i=0; i < img_list.length; i++) {
    document.preloadlist[top+i]     = new Image;
    document.preloadlist[top+i].src = img_list[i];
  } 
}