The above could be written
<img style="WIDTH: 200px; HEIGHT: 75px"
src="{$urlpath}/{IMAGES/HEADER}"/>
But do be aware that simple string concatenation is not really the right
approach for resolving a relative URI against a base URI. The proper
algorithm is described in RFC 2396. XPath 2.0 implements it using a new
resolve-uri() function; in the meantime you might want to consider doing
it by calling an extension function - for example the relevant method in
JDK 1.4's java.net.URI class.
Michael Kay
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list