function preLoadImages(){
var t='<layer top="-100" left="0" visibility="hide"><div style="position:absolute; top:-100px; left:0px; visibility:hidden">';
for(i=0;i<arguments.length;i++)t+='<img src="'+arguments[i]+'" height="10" width="10">';
t+='</div></layer>';
document.write(t);
}

preLoadImages('/images/kuulumiset-bg2.gif', '/images/ohjelmamenu-tapahtuma-bg2.gif');