diff --git a/xml2xslt.xsl b/xml2xslt.xsl
index bc31199..f4db06c 100755
--- a/xml2xslt.xsl
+++ b/xml2xslt.xsl
@@ -71,6 +71,9 @@
 				</xsl-out:element>
 				-->
 				
+				<!-- Default to PNG images for web dispay. -->
+				<xsl-out:param name="image-format">png</xsl-out:param>
+
 				<!-- New, simplified version: -->
 				<xsl-out:output method="html" encoding="ISO-8859-1" media-type="text/html" doctype-public="-//W3C//DTD HTML 4.01 Transitional//EN"/>
 			<!-- Nope, includes can only appear as a child of xsl:stylesheet. -->