var preloadImg = new Array();
preloadImg["disc_out"] = new Image(); preloadImg["disc_out"].src = "../../media/nav/disc_out.gif";
preloadImg["disc_over"] = new Image(); preloadImg["disc_over"].src = "../../media/nav/disc_over.gif";
for(i=1;i<=4;i++){
	preloadImg["nav"+i+"_out"] = new Image(); preloadImg["nav"+i+"_out"].src = "../../media/nav/nav"+i+"_out.gif";
	preloadImg["nav"+i+"_over"] = new Image(); preloadImg["nav"+i+"_over"].src = "../../media/nav/nav"+i+"_over.gif";
}

function roll(imNr,dir)
	{
	document.images["nav"+imNr].src = preloadImg["nav"+imNr+"_"+dir].src;
	document.images["disc"+imNr].src = preloadImg["disc_"+dir].src;
	}