Cannot edit Code Blocks

Yes. If I paste the form code into a regular text block in the text tab and hit save it doesn’t ever close out that popup window like it would with regular text. But its working fine with regular text…?

Here’s a stripped down portion of my code if that helps :

<form id="form" action="http://url.com...." method="post" class="useFormBg">

<input type="hidden" value="POST" name="PostForm">                                                
		<fieldset>
			<legend>For more information, please fill out the form below:</legend>
			<ul id="crmform">
				<li>
					<label for="First Name">First Name<font color="red">*</font></label>
					<input class="validate[required]" type="text" name="firstName" id="firstName" value="" size="30" />
				</li>
				<li>
					<label for="Last Name">Last Name<font color="red">*</font></label>
					<input class="validate[required]" type="text" name="lastName" id="lastName" value="" size="30" />
				</li>
				<li>
					<label for="Date of Birth">Date of Birth<font color="red">*</font></label>
					<input class="validate[required,custom[date]]" type="text" name="Dob" id="child1Dob" value="" size="30" />
					<script>
						$(function() {
							$( "#child1Dob" ).datepicker();
						});
					</script>
				</li>
			</ul>
		</fieldset>
	<button type="submit" class="submit" >Send</button>
</form>

Thanks for your help!