moz_on = new Image();
moz_on.src = "images/button_moz_over.gif";
moz_off = new Image();
moz_off.src = "images/button_moz_off.gif";

wilde_on = new Image();
wilde_on.src = "images/button_wilde_over.gif";
wilde_off = new Image();
wilde_off.src = "images/button_wilde_off.gif";

topten_on = new Image();
topten_on.src = "images/button_topten_over.gif";
topten_off = new Image();
topten_off.src = "images/button_topten_off.gif";

logos_on = new Image();
logos_on.src = "images/button_logos_over.gif";
logos_off = new Image();
logos_off.src = "images/button_logos_off.gif";

function rollOn(imgName) {
	if(document.images) {
		document [imgName].src = eval(imgName + '_on.src');
	}
}

function rollOff(imgName) {
	if(document.images){
		document [imgName].src = eval(imgName + '_off.src');
	}
}