Dynamic image as table background

Hello list,

Is there a way to serve a dynamic image as table background ?

I have try to use a WOGenericContainer as Table  where imageBackground 
method  returns NSData of the image.

GenericContainer1: WOGenericContainer {
 background = imageBackground ;
 border = 1;
 cellpadding = 0;
 cellspacing = 0;
 elementName = "TABLE";
 height = hauteurTableau;
 width = largeurTableau;
}

Without success, as  I get the following trace :

[2006-01-31 12:31:29 CET] <WorkerThread1> 
<com.webobjects.appserver._private.WODirectActionRequestHandler>: Exception 
while handling action named 
"{values%20=%20{dataimage%20=%20<class%20com.webobjects.foundation.NSData%20(offset=0,%20length=30598,%20data=[-1]'" 
on action class "null" :java.lang.reflect.InvocationTargetException
[2006-01-31 12:31:29 CET] <WorkerThread1> 
java.lang.reflect.InvocationTargetException
 at 
com.webobjects.appserver._private.WOActionRequestHandler._handleRequest(WOActionRequestHandler.java:250)
 at 
com.webobjects.appserver._private.WOActionRequestHandler.handleRequest(WOActionRequestHandler.java:142)
 at 
com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1306)
 at 
com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:173)
 at 
com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:254)
 at java.lang.Thread.run(Thread.java:536)
Caused by: java.lang.NoSuchMethodException: 
DirectAction.{values%20=%20{dataimage%20=%20<class%20com.webobjects.foundation.NSData%20(offset=0,%20length=30598,%20data=[-1]'Action()
 at 
com.webobjects.appserver.WODirectAction.performActionNamed(WODirectAction.java:125)
 at 
com.webobjects.appserver._private.WOActionRequestHandler._handleRequest(WOActionRequestHandler.java:240)


Thank for any idea.


Pierre Gilquin