function preload() { //prefix, path, roll images
var d=document;var a=arguments;
if (d.plArr == null) d.plArr = new Array();
var pl=new Array();
pl[0] = a[0];
for(var i=2;i<a.length;i++){pl[i-1]=new Image;pl[i-1].src=a[1]+a[i];}
d.plArr[d.plArr.length] = pl;
}

function rollover(p,id,s) { //prefix, image name, state
var d=document;
for (var i=0;i<d.plArr.length;i++) if (d.plArr[i][0] == p) var pl=d.plArr[i];	
var di='d.img'+p+id;if(s){eval(di).osrc=eval(di).src;eval(di).src=pl[id+1].src;}else eval(di).src=eval(di).osrc;
}