computing an attribut value (newbie's question)

Hi there all, 

maybe someone can help me on that issue.

Consider I have the following XSLT statement:

<xsl:if test="./@type='bitmap'">
	<IMG .... src="mybitmaps/test/mmmmm.jpg"></IMG>
<xsl:if>

>From my understanding it writes an node (the IMG-Node element) to the
output tree, when the condition comes true in the xsl:if statement.
Fine. No problem. But the src - attribute's value has to be computed
depending on a value in my xml-file, say ./color="xxx". Actually mmmmm
has to be computed to say mmmmmRED. 

As far as I tried, you can do that by writing 

<xsl:if test="./@type='bitmap'">
	<IMG .... src="mybitmaps/test/mmmmm{./@color}.jpg"></IMG>
<xsl:if>

Why does this work? 

Can I use a variable for accomplishing the job like

<xsl:if test="./@type='bitmap'">
	<xsl:if test="./@color="xxx">
		<xsl:variable name="MyCol" select="yyy"/>
	</xsl:if>
	
	<!-- and now I want to use the variable in that src-statement -->
	<IMG .... src="mybitmaps/test/mmmmm.jpg"></IMG>
<xsl:if>

Any help welcome. Thanks in advance.

Ciao,

- Chris


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