gracias outoforder !
el select ya tenía colocado el name=industry..
aqui dejo el codigo entero...
Código PHP:
<select name="industry" class="text_menu2on" style="width:218px;font:Arial;font-size:9px;" onchange="MM_jumpMenu('parent',this,0)">
<option>choose one</option>
<option value="logo-designs.php?secc=all" <? if ($industry == "logo-designs.php?secc=all") echo "selected" ?>>ALL</option>
<option value="logo-designs.php?secc=anim_rel" <? if ($industry == "logo-designs.php?secc=anim_rel") echo "selected" ?>>ANIMALS RELATED</option>
<option value="logo-designs.php?secc=arq" <? if ($industry == "logo-designs.php?secc=arq") echo "selected" ?>>ARCHITECTURE AND CONSTRUCTION</option>
<option value="logo-designs.php?secc=art" <? if ($industry == "logo-designs.php?secc=art") echo "selected" ?>>ART, DESIGN AND PHOTOGRAPHY</option>
</select>