un chiarimento x immagini random

[zeweb]

e come preload posso usare questo ?

<script language="JavaScript" type="text/JavaScript"> 
<!-- 
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];}} 
} 
//--> 
</script>