var nMaxItem=4;
var NameIndex=0;
var DefaultState=1;
var MouseOverState=2;
var MouseDownState=3;
var imgCounter=0;
var ImageList=new Array();
var appName=navigator.appName;
var appVers=navigator.appVersion;
var bIsSupportOK=(
  ((navigator.appName=="Netscape") && (parseInt(navigator.appVersion)>=3)) ||
  ((navigator.appName=="Microsoft Internet Explorer") && (parseInt(navigator.appVersion)>=4))
);
function AddImageToImageList(name, Default, MouseOver, MouseDown) {
  ImageList[imgCounter]=new Array(nMaxItem);
  ImageList[imgCounter][NameIndex]=name;
  ImageList[imgCounter][DefaultState]=new Image();
  ImageList[imgCounter][DefaultState].src=Default;
  if(MouseOver != "") {
    ImageList[imgCounter][MouseOverState]=new Image();
    ImageList[imgCounter][MouseOverState].src=MouseOver;
  }
  if(MouseDown != "") {
    ImageList[imgCounter][MouseDownState]=new Image();
    ImageList[imgCounter][MouseDownState].src=MouseDown;
  }
  imgCounter++;
}
function ReplaceImage(name, state) {
  for(i=0; i<imgCounter; i++) {
    if(document.images[ImageList[i][NameIndex]] != null) {
      if((name==ImageList[i][NameIndex]) && (ImageList[i][state] != null))
        document.images[name].src=ImageList[i][state].src;
    }
  }
}
AddImageToImageList("tag_zbuyme", "images/zbuyme_normal.gif", "images/zbuyme_over.gif", "images/zbuyme_down.gif");