brand = document.getElementById('brand');
	
	brand.style.display = 'none';
	
	function next(selected) {
		// var selected = selected;
		if(selected == "global") {

				// call the brands down via ajax
				
		} else if(selected == "brand") {
			
			xajax_getBrands();
			
			
		}
	}

<form action="?action=manage_settings&amp;do=add&amp;formsubmitted=true" method="POST" name="settings">
	<div class="row">
		<label for="settingtype">Setting Type:</label>
		<select name="settingtype" id="settingtype" onchange="next(this.options[this.selectedIndex].value);">
			<option label="global" value="global">Global</option>
			<option label="brand" value="brand">Brand</option>
			<option label="build" value="build">Build</option>
			<option label="number" value="number">Number</option>
		</select>
	</div>
	<div class="row" id="brand">
		<select name="brandid" id="brandid">
			{html_options values=$brands.brandid output=$brands.name}
		</select>
	</div>


	<div class="row">
		<input type="submit" value="Add settings">
	</div>
</form>