Remove few fields

Hello,

I want to remove URL, EMAIL and SUBJECT fields, how can I do that? I tried just to remove it from html table but it doesn’t let me send then.

Example, that’s subject’s code that I removed, after this, it won’t work

<tr>
			<td class="field">'.__("Subject").' <span class="required">*</span></td>
			<td><input type="text" name="subject" /></td>
		</tr>

Can anyone help me?

Thank you very much, and by the way it is VERY good plugin, awesome work author!

http://wordpress.org/extend/plugins/answer-my-question/