var here = "";
var doc_root  = "";
var category  = new Array("home","prod","srch","sppt","corp");
var on_menu   = new Array();
var off_menu  = new Array();
var here_menu = new Array();
var timer;

for(var i in category){
   var name = category[i];
   on_menu[name]   = new Image();
   off_menu[name]  = new Image();
   here_menu[name] = new Image();
   here_menu[name].src = doc_root + "/img/menu/" + name + ".gif";
   on_menu[name].src   = doc_root + "/img/menu/" + name + "_on.gif"; 
   off_menu[name].src  = doc_root + "/img/menu/" + name + "_off.gif";
}

function on_list(name){
   if(!here) return false;
   for(var i in category){
      if(name != category[i]) hide_list(category[i]);
   }
   clearTimeout(timer);
   show_list(name);
}
function show_list(name){
   if(!here) return false;
   document.images['menu_' + name].src = on_menu[name].src;
   if(!list[name]) return false;
   if(document.layers) return false;
   var layType = document.getElementById('menu' + name).style;
   layType.visibility = 'visible';
}

function off_list(name){
   if(!here) return false;
   timer = setTimeout("hide_list(\"" + name + "\")",100);
}
function hide_list(name){
   if(!here) return false;
   document.images['menu_' + name].src = (name == here) ? here_menu[name].src
                                                        : off_menu[name].src;
   if(!list[name]) return false;
   if(document.layers) return false;
   var layType = document.getElementById('menu' + name).style;
   layType.visibility = 'hidden';
}