XSLT to display news item images with consistent size - image

Question

I have a RSS XML news file, which contains a list of items inclusive of a URL to an image. I also have an associated XSLT.
The problem is that the image sizes are not consistent and I want to limit the image sizes, resize them, to a nice thumbnail.
How would I modify the XSLT to accomplish that?
XML Sample:
<?xml version="1.0" encoding="UTF-8" ?>
<rss version ="2.0" xmlns:g="http://base.google.com/ns/1.0">
<channel>
<title>Company Name</title>
<description>Company description</description>
<link>http://www.mycompanyurl.com</link>
<item>
<title>News Item Title</title>
<link>http://www.whateverurl.com/</link>
<category>Space</category>
<pubDate>12 April 1961</pubDate>
<description>Software to reduce your job search to a half hour per day. all major job sites, job boards, classifieds. unemployment paperwork, CRM, interviews, more</description>
<image>
<url>~/App_Data/NewsControl/whatever.png</url>
<title>Whatever1</title>
<link>javascript:void(0)</link>
</image>
<g:id>1</g:id>
<g:brand>Whatever2</g:brand>
<g:condition>whatever3</g:condition>
<g:price>$whatever4</g:price>
<g:product_type>Whatever5</g:product_type>
</item>
</channel>
</rss>
Here is the associated XSLT:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<items>
<xsl:for-each select="//item">
<item Name="{position()}" HeaderText="{title}" Text="{description}" NavigateUrl="{position()}" Date="{pubDate}" ImageUrl="{image/url}"/>
</xsl:for-each>
</items>
</xsl:template>
</xsl:stylesheet>
Results of First Answer:
<items>
<xsl:for-each select="//item">
<item Name="{position()}" HeaderText="{title}" Text="{description}" NavigateUrl="{position()}" Date="{pubDate}" ImageUrl="/Tools/thumber.php?img={image/url}"/>
</xsl:for-each>
</items>
I made these changes, enabled PHP on the server (testing on from the server and locally), and saw 2 issues:
1. I get no image, merely a no image box.
If I try to edit the ImageUrl and tack on a "&W=xxx&H=xxx", the Visual Studio validator complains and throws up errors on the &.
Update 2
Here is the latest line in the XSLT:
http://myserver.com/Tools/thumber.php?img=',image/url)}"/>
The corresponding image section in the XML
<image>
<url>/Products/Jobfish/Images/Boxshots/Jobfish_DVDCaseCD_ShadowOut.jpg</url>
<title>Jobfish</title>
<link>javascript:void(0)</link>

Answer 1

XSLT has no built in function for resizing or thumbnailing. You will have to use an external processor for that eg. by using a PHP thumbnail generator.
Then replace the original image path with a URL pointing to your thumbnail generator, with the source being the original image.
suppose ImageUrl = mediaserver.xyz/ourlogo.jpg
the new ImageUrl would become myserver.com/thumbnailgenerator.php?src=http://mediaserver.xyz/ourlogo.jpg
Please make shure you select a caching thumbnail library (eg https://code.google.com/p/phpthumbmaker/wiki/ThumberWiki ) , since it will be a serious resource hog if you skip that. Also take into account copyright issues when re-serving these thumbnails.