function getElementsByClassName(searchClass, node, tag) {
	if (node == null) { node = document; }
	if (node.getElementsByClassName)
		return node.getElementsByClassName(searchClass);
	if (tag == null) { tag = '*'; }
	else {
		var classElements = new Array();
		// safari mac 2.0 doesn't support this
		var els = node.getElementsByTagName(tag);

		var elsLen = els.length;
		var pattern = new RegExp("(^|\s)" + searchClass + "(\s|$)");
		for (var i = 0, j = 0; i < elsLen; i++) {
			if (pattern.test(els[i].className)) {
				classElements[j] = els[i];
				j++;
			}
		}
		return classElements;
	}
}