newbie--using variables

Hi,

I'm trying to display an image and for the source, I'd like to use a 
variable because the path to the image will change from time to time.  
Is something like this possible?  If not, can anyone suggest another 
way?  Here is an example:

I declare my variable on top and use it down below:

<xsl:variable name="logo"> 
	<xsl:choose> 
		<xsl:when test="//xsl_logo='Y'">
			<img height="40" 
src="\\csmpls18m\data\application\images\nsslogoblue.gif" 
width="120"></img>
		</xsl:when> 
	</xsl:choose> 
</xsl:variable> 


<td valign="top"><xsl:value-of select="$logo"/>

Thank you!

Jitt


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