var CatPrefix="cat";
var ImgPrefix="img_";
function ShowHideCategory(index) {
   var folderDIV=document.getElementById(CatPrefix+index);
   var imgObj=document.getElementById(ImgPrefix+index);
   if (folderDIV==null || imgObj==null) return false;
   if (imgObj.src.indexOf("menu_icon_minus.gif")==-1) {
       imgObj.src="/templates/web/images/menu_icon_minus.gif";
       folderDIV.style.display="block";
   } else {
       imgObj.src="/templates/web/images/menu_icon.gif";
       folderDIV.style.display="none";
   }
   return true;
}