Can I deselect one from 2 different listbox selections

If I have two listboxes like these:

[CODE]
<select name=”select1″ size=”3″ onChange=”generateimage(this.options[this.selectedIndex].value)” align=”left”>
<option value=”five.jpg”>Five</option>
<option value=”phone.jpg”>Phone</option>
<option value=”roadmap.jpg”>Roadmap</option>
</select>

<select name=”select2″ size=”2″ onChange=”generatelink(this.selectedIndex)” align=”right”>
<option value=”phone_card_request.html”> Phone/Card Request</option>
<option value=”custom_reference_video_clip.html”>Custom Reference Video Clip</option>
</select>
[/CODE]

Is there a way where if one is chosen and that selection becomes highlighted blue, the blue highlight in the second box clears?

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