Simple Forms and Ajax

So, I'm not seeing any good ways of returning a script block that can be executed on the client side.  What i was doing was having a block of javascript validation code below my block of html form elements.  I couldn't get this working, it may just not be possible, I'll try again later.  However, you can put all of the javascript you need into the onclick event of a button.  So trying that, I now have this, which isn't pretty, but my intentions are that the form would be autogenerated anyway, so I don't think I'll care about how pretty it is.

<form>
	<table>
		<tr>
			<td>
				<label>
					First Name:</label>
			</td>
			<td>
				<input type="text" id="FirstName" />
			</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
			<td>
				<input type="button" value="Save" onclick="
				if($('FirstName').value.length == 0){
					alert('First Name is required!');
					$('FirstName').activate();
					return false;
				};
				" />
			</td>
		</tr>
	</table>
</form>


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