function addTag(formName, elem, tagType) {
	var str = "";
	switch (tagType) {
		case "img": {
			str = "[img][/img]";
			break;
		}
		case "b": {
			str = "[b][/b]";
			break;
		}
		case "i": {
			str = "[i][/i]";
			break;
		}
		case "u": {
			str = "[u][/u]";
			break;
		}
		case "email": {
			str = "[email][/email]";
			break;
		}
		case "url": {
			str = "[url][/url][link][/link]";
			break;
		}
	}	
	document.forms[formName].elements[elem].value = document.forms[formName].elements[elem].value + str;
}