Insert <options> from XML

Hi,
How I can make this ?
I have an XML like this :
 .....
<ROOM quantity="5">
......
</ROOM>
<ROOM quantity="2">
......
</ROOM>

I want to create an <option> from a select reading quantity attribute like
something like this but it doesn't work:
I do this for each ROOM:

                  <xsl:variable name="num" select="1"/>
                   <select class="combo" name="QRoom" id="QRoom">
                           <option value="0" selected="selected">0</option>
                             <xsl:for-each select="ROOM/@quantity">
                          <option>
                                 <xsl:attribute name="value">
                                   <xsl:value-of select="$num" />
                                 </xsl:attribute>
                                 <xsl:value-of select="$num" />
                           </option>
                           <xsl:variable name="num" select="number($num) +
1"/>
                          </xsl:for-each>
                       </select>

Finally I want two selects whithin 5 and 2 <option>'s.

Thanks a lot.
Frank



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