function rollOver(id, lang) {
	var elem = document.getElementById(id);
	var original = elem.src;
	var src_over = new String(original);
	src_over = src_over.replace("_" + lang + ".jpg", "_over_" + lang + ".jpg");
	elem.src = src_over;
}

function rollOut(id, lang) {
	var elem = document.getElementById(id);
	var original = elem.src;
	var src_over = new String(original);
	src_over = src_over.replace("_over_" + lang + ".jpg", "_" + lang + ".jpg");
	elem.src = src_over;
}

function preLoad(id, lang) {
	var preImage = new Image();
	preImage.src = document.getElementById(id).src;
	var src_over = new String(preImage.src);
	src_over = src_over.replace("_" + lang + ".jpg", "_over_" + lang + ".jpg");
	preImage.src = src_over;
}