javascript question

[error_22]

Hi,

Im trying to make a form....but I think I need a javascript to get it the way i want it.

I have this html code:

<select name="ltype">
<option selected>Choose type</option>
<option value="maindir">Main menu - direct link</option>
<option value="subdir">Sub menu - direct link</option>
</select>

If the first option is selected (Main menu - direct link) i want my next part of the form to show up. If the second option is selected i want another part of the form to show up. Is this possible with javascript? Where can i find information about this?

Thanks in advance!