String comparison

Hi

I have the following section of XML which I am parsing using the XSL
included below it.  At the position marked "### conditional test here! ###"
I am wanting to do a simple test where I examine the current URL from the
"for-each select" statement to see if it contains the string "http://".  If
it does, the target of the resulting HTML HREF should be "_top" causing the
page to load in the entire browser window.  If the URL does not contain the
"http://" string the page should be loaded in the "ESRCanvas" frame as is
currently happening.

I'm just starting to learn the XSLT language, but presume I need to use a
"choose .... otherwise" statement to get this test to work.  I am, however,
not so sure on how I do the match between the current URL and the string
"http://".  I have experimented with the contains() and starts-with() tests
but so far without much success.  Perhaps I am not using the correct
stylesheet version ?

I do not quite know where I am going here so would greatly appreciate some
help.

TIA
Geoff

<?xml version="1.0"?>
<?xml:stylesheet type="text/xsl" href="menus.xsl"?>

<TOPICLIST TYPE="ESR Intranet">
   <TOPICS TYPE="ESR">
      <TOPIC>
         <TITLE>Home</TITLE>
         <URL>/default.asp</URL>
      </TOPIC>
    </TOPICS>
    <TOPICS TYPE="Databases &amp; Services">
      <TOPIC>
         <TITLE>Staff Directory</TITLE>
 
<URL>http://intranet/cgi-bin/gateway.exe?displayform=update/manixsue</URL>
      </TOPIC>
    </TOPICS>
</TOPICLIST>


<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">

<!-- MENUS.XSL -->

<xsl:template match="/">
    <TITLE><xsl:value-of select="TOPICLIST/@TYPE" /></TITLE>
    <LINK REL="stylesheet" TYPE="text/css" HREF="/ESRscripts/menus.css" />
    <SCRIPT LANGUAGE="JScript" SRC="/ESRscripts/menus.js"></SCRIPT>

    <!-- BUILD MENUBAR -->

    <DIV ID="divMenuBar">
    <TABLE ID="tblMenuBar" BORDER="0">
    <TR height="50%">
	
    <xsl:for-each select="//TOPICS[TOPIC]">
        <TD CLASS="clsMenuBarItem" VALIGN="BOTTOM">
            <xsl:attribute name="ID">tdMenuBarItem<xsl:value-of
select="@TYPE" /></xsl:attribute>
	<A CLASS="clsTopLevelLink"><xsl:attribute name="HREF"><xsl:value-of
select="@TURL" /></xsl:attribute><xsl:value-of select="@TYPE" /></A> 
        </TD>
        <xsl:if test="context()[not(end())]">
        <TD VALIGN="BOTTOM">|</TD>
        </xsl:if>
    </xsl:for-each>
	
    </TR>
    </TABLE>
    </DIV>
		
    <!-- BUILD INDIVIDUAL MENUS -->
	
    <xsl:for-each select="//TOPICS[TOPIC]">
        <DIV CLASS="clsMenu" Left="0">
        <xsl:attribute name="ID">divMenu<xsl:value-of select="@TYPE"
/></xsl:attribute>
	<DIV CLASS="clsMenuSpacer"></DIV>
	<xsl:for-each select="TOPIC">
	<DIV>

	### conditional test here! ###

	<A TARGET="ESRCanvas">
	    <xsl:attribute name="HREF"><xsl:value-of select="URL"
/></xsl:attribute>
	    <xsl:value-of select="TITLE" />
	</A>
	</DIV>
        </xsl:for-each>
        </DIV>
    </xsl:for-each>
	
</xsl:template>

</xsl:stylesheet>

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