if (document.images) {
	var tb = new Image();
	tb.src = "tb.bmp";
	var tb1 = new Image();
	tb1.src = "tb1.bmp";
}

function act(imgName) {
	if (document.images)
	document.images[imgName].src = eval(imgName + "1.src");
}

function inact(imgName) {
	if (document.images)
	document.images[imgName].src = eval(imgName + ".src");
}