Referring to images from portal theme attributes

In our branded and customized theme we have a problem. Some background images are not displayed. The properties are set as displayed at the end of this message, I am not familiar with this type of value. The background image is White, and then an url to an (external file:outside the theme???) is given that points to an image. which cannot be found when putting the url directly into a portal session.
Is this background indeed a file outside the theme archive? and where could I look to find this?!
I thank you in advance, points will be awarded for good answers!
greetings Ron van Kessel
Portal Theme TLN Attribute:
Background Color of Selected Tabs
Current value:
#FFF;background:url(/irj/portalapps/com.app.portal.repository.mimes/images/tln_topbar_on.gif) repeat-x top left;

The answer was to use EL within JSF:
[http://forums.java.net/jive/thread.jspa?messageID=374172|http://forums.java.net/jive/thread.jspa?messageID=374172]

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Referring to images from portal theme attributes

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