function MM_preloadImages() { //v3.0
  var d=document; 
  if(d.images)
  {
   if(!d.MM_p) 
    d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; 
    for(i=0; i<a.length; i++)
        if (a[i].indexOf("#")!=0)
        { 
            d.MM_p[j]=new Image; 
            d.MM_p[j++].src=a[i];
        }
    }
}

function hover(o, action)
{
    var search;
    var replace;
    switch (action)
    {
        case "over":
            search = ".";
            replace = "Over.";
            break;
        case "out":
            search = "Over.";
            replace = ".";
            break;
    }
    setHoverImg(document.getElementById(o.id + "_top"), search, replace);
    setHoverImg(document.getElementById(o.id + "_center"), search, replace);
    setHoverImg(document.getElementById(o.id + "_bottom"), search, replace);
}

function setHoverImg(o, search, replace)
{
    var bgImg = o.style.backgroundImage;
    var splicePos = bgImg.lastIndexOf(search);
    var pfx = bgImg.substring(0, splicePos);
    var sfx = bgImg.substring(splicePos + search.length, bgImg.length);
    o.style.backgroundImage = pfx + replace + sfx;
}