function changeImage(newImg,perspective) {
	if (arguments.length == 1) {
		perspective = "l";
	}

	document.mainimage.src = "showcase/" + newImg + "big.gif";
	
	if (perspective == "p") {
		document.mainimage.width  = 340;
		document.mainimage.height = 420;
	} else {
		document.mainimage.width  = 340;
		document.mainimage.height = 420;
	}
}