//side navigation
if (document.images != null)
  
{
ontop = new Array (6); offtop = new Array (6);
for (i=1;i<6;i++) {ontop[i] = new Image; offtop[i] = new Image;}

ontop[1].src="img/nav/eyeglasses_.gif";
ontop[2].src="img/nav/sunglasses_.gif";
ontop[3].src="img/nav/repair_.gif";
ontop[4].src="img/nav/anti_.gif";
ontop[5].src="img/nav/ask_.gif";

offtop[1].src="img/nav/eyeglasses.gif";
offtop[2].src="img/nav/sunglasses.gif";
offtop[3].src="img/nav/repair.gif";
offtop[4].src="img/nav/anti.gif";
offtop[5].src="img/nav/ask.gif";
}
function top_on(n) {if (document.images != null) {document.images["i"+(n+"")].src=ontop[n].src;}}
function top_off(n) {if (document.images != null) {document.images["i"+(n+"")].src=offtop[n].src;}}