function changeInset(obj) {
	var bigimgurl = obj.getAttribute("bigimgurl");
	var bigimgurl2 = obj.getAttribute("bigimgurl2");
	var mainimg = document.getElementById("mainimg");
	var mainlink = document.getElementById("thickbox");
	
	var newImg = new Image();
	newImg.src = bigimgurl;
	
	mainimg.width = newImg.width;
	mainimg.height = newImg.height;
	mainimg.src = bigimgurl;
	
	mainlink.href = bigimgurl2 + ".jpg";
}