function $(id) {
	return document.getElementById(id);
}

function getByClassName(elm, tag, cname) {
	var els = (tag == "*" && elm.all) ? elm.all : elm.getElementsByTagName(tag);
	var ret = new Array();
	var rexp = new RegExp("(^|\\s)" + cname.replace(/\-/g, "\\-") + "(\\s|$)");
	for (var i in els)
		if (rexp.test(els[i].className))
			ret.push(els[i]);
	return ret;
}