hiim new to umbraco and macros are confusing me :(

 - im trying to make a button that the webuser can pick two pictures for - mouseover - mouseoff.

how do i pull two different mediapickers into this macro - i can only write in the one variable there. and i dont know how to get a second (thought just making a

<xsl:variable name="media" select="umbraco.library:GetMedia(number(data[@alias='excommknap']), 0)" />
<xsl:variable name="media2" select="umbraco.library:GetMedia(number(data[@alias='excommhoverknap']), 0)" />

would do it but i might be getting the wrong idea of this.

can anyone tell me how i can pull out two mediapickers ?.

(heres what i got)

<xsl:for-each select="$currentPage/ancestor-or-self::node [@level=$level]/node [string(data [@alias='umbracoNaviHide']) != '1']">
 <!-- check if the 'media picker' property has a value -->
 <xsl:if test="data[@alias='excommknap'] != ''">
 
 <!-- get the media XML and assign it to a variable -->
 <xsl:variable name="media" select="umbraco.library:GetMedia(number(data[@alias='excommknap']), 0)" />
                                                       
 <!-- check if the media XML contains an image path 'umbracoFile' -->
  <xsl:if test="count($media/data[@alias='umbracoFile']) &gt; 0">
   <a href="{umbraco.library:NiceUrl(@id)}">

   <img class="ExcommKnap" src="{$media/data[@alias='umbracoFile']}" border="0"
   onmouseout="this.src='{$media/data[@alias='umbracoFile']}';this.alt='Der opstod en fejl med billede';"
   onmouseover="this.src=' <------this is where i want the second media picker to be placed ---------> ';this.alt='Der opstod en fejl med billede';"/>

   </a>
  </xsl:if>
 </xsl:if>
</xsl:for-each>

any help is appreciated.