Code HTML4Strict:
<label>Show div?</label>
<div class="show and hide this div when toggling yes and no on selectbox">
some other select boxes with different options

If someone take the option YES, then div under will show, and if the user changes his option to NO, i want it to be hidden again. In fact I want to make all the options he first choose in the hidden div to be obsolete and don't show in the email output.

So if he choose NO i don't want the extra fields/options in the hidden div to be shown in the email-output, only if he choose YES and fills them out.

Hope someone understand what Im trying to convey, my english isn't the best.