var index = 0;
var imgobj = new Array();

function preloader(name, onimg, offimg) {
    imgobj[index] = new Array(3);
    imgobj[index][0] = new Image();
    imgobj[index][0].src = onimg;
    imgobj[index][1] = new Image();
    imgobj[index][1].src = offimg;
    imgobj[index][2] = name;
    index = index + 1;
}

function imgRoll(name, on) {
	for (i = 0; i < index; i++) {
		if (name == imgobj[i][2]) 	{
			if (on == "on") {
				document.images[imgobj[i][2]].src =imgobj[i][1].src;
			} else {
				 document.images[imgobj[i][2]].src =imgobj[i][0].src;
			}
		}
	}
}

function Go(){return}