var dom, nn4, ie;
dom = (document.getElementById)? true : false;
nn4 = (document.layers)? true : false;
ie = (document.all && !dom)? true : false;

var preloadedImages = new Array();
function preloadImages(locationFolder) {
    if(document.images) {
            var i, args = preloadImages.arguments; 
            for(i=1; i<args.length; i++) {
                preloadedImages[args[i]]   = new Image(); 
                preloadedImages[args[i]].src   = locationFolder + args[i];
            }
    }
}
function rollOn(imageName) {
    if(document.images)
      document.images[imageName].src = preloadedImages[imageName + "_over.gif"].src;
}
function rollOff(imageName) {
    if(document.images)
      document.images[imageName].src = preloadedImages[imageName + "_normal.gif"].src;
}
preloadImages('http://www.rovesnik.ru/upload/images/', 'menu_house_normal.gif', 'menu_house_over.gif', 'menu_comics_normal.gif', 'menu_comics_over.gif', 'menu_journal_normal.gif', 'menu_journal_over.gif');

function showMenu(id, num){
   var menuStyleObj, menuLeftShift, i ;
      if (ie){
	     menuLeftShift = hl.offsetWidth+(num-1)*260;
	     menuStyleObj = document.all[id].style;
	     menuStyleObj.left =  menuLeftShift;
	     menuStyleObj.visibility = "visible";
      } 
      if (nn4){ 
            menuStyleObj = document.layers[id];
            menuLeftShift = document.layers['ma'].pageX+(num-1)*260;
            menuStyleObj.left = menuLeftShift;
            menuStyleObj.visibility = "show";  
       }
      if (dom){
         menuStyleObj = document.getElementById(id).style;
         menuLeftShift = document.getElementById('hl').offsetWidth+(num-1)*260;
         menuStyleObj.left = menuLeftShift;
         menuStyleObj.visibility = "visible";  
     }     
}
function hideMenu(id){ 
   if (ie) {
      document.all[id].style.visibility = "hidden";
   } 
   if (nn4){
        alert(document.layers[id].visibility)
        document.layers[id].visibility = "hide";
   }
   if (dom){
        document.getElementById(id).style.visibility = "hidden";
   }    
}