function background_over(name,type){
var img = document.getElementById(name);
img.style.backgroundImage="url('images/" + name + "_hover." + type + "')"; 
}
function background_out(name,type){
var img = document.getElementById(name);
img.style.backgroundImage="url('images/" + name + "." + type + "')";
}
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];}}
}