function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) {
		elm.addEventListener(evType, fn, useCapture);
		return true;
	}
	else if (elm.attachEvent) {
		var r = elm.attachEvent('on' + evType, fn);
		return r;
	}
	else {
		elm['on' + evType] = fn;
	}
}

function toggle(elm) {
	if ( elm.style.display != 'none' ) {
		alert(elm);
		elm.style.display = 'none';
	}
	else {
		elm.style.display = '';
	}

}

function getElementsByClass(searchClass, node, tag) {
	var classElements = new Array();
	if (node == null) {
		node = document;
	}
	if (tag == null) {
		tag = '*';
	}
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\s)"+searchClass+"(\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if (pattern.test(els[i].className)) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

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