se non vado errato questo e' quello che manca
codice:
function MM_swapImgRestore() { //v3.0 
	var i,x,a=document.MM_sr; 
	for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc; 
} 

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 MM_findObj(n, d) { //v3.0 
	var p,i,x; 
	if(!d) d=document; 
	if((p=n.indexOf("?"))>0&&parent.frames.length){
		d=parent.frames[n.substring(p+1)].document; 
		n=n.substring(0,p);
	} 
	if(!(x=d[n])&&d.all) x=d.all[n]; 
	for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) 
	x=MM_findObj(n,d.layers[i].document);
	return x;
} 

function MM_swapImage() { //v3.0 
	var i,j=0,x,a=MM_swapImage.arguments; 
	document.MM_sr=new Array;
	for(i=0;i<(a.length-2);i+=3){
		if ((x=MM_findObj(a[i]))!=null){
			document.MM_sr[j++]=x; 
			if(!x.oSrc) x.oSrc=x.src; 
			x.src=a[i+2];
		}
	}
}