drop down menus

[eluser]babu[/eluser]
hello experts,
i need help regarding drop down menus.In my dropdownmenu,options values should get from the database.

example for static dropdownmenus.

<tr>
<TD align="right" width="120" class="forrowcolr">
&lt;?php echo form_label('Category : ');?&gt;
</TD>
<TD align="left" class="forrowcolr">&lt;?php $options = array('Books'=>'Books','Calligraphy'=>'Calligraphy','Miniatures'=>'Miniatures','Prints'=>'Prints','Watercolours'=>'Watercolours','Photographs'=>'Photographs');?&gt;
&lt;?php echo form_dropdown('category', $options);?&gt;</TD>

</tr>

here the values are static.what i need is,options values should get from the database.if i change anything from the database.options values should get updated.very urgent pls..thanks in advance