Exception not caugth

Hi,

I've found a website that causes mobileOk to crash.

The website is http://www.latavolacalda.co.uk/ (it is the last word in 
web design) and mobileOk throws the exception below.  It could be caused 
by a  transparent GIF image with a wrong format.
Capturing the IndexOutOfBoundsException in the 
HTTPImageResource.checkTransparency method is a solution, despite I 
don't like to catch RuntimeExceptions, so any other idea is welcomed.

Exception in thread "main" org.w3c.mwi.mobileok.basic.TestException: 
java.util.concurrent.ExecutionException: 
java.lang.reflect.InvocationTargetException
    at 
org.w3c.mwi.mobileok.basic.Preprocessor.extractResourcesAsynchronously(Preprocessor.java:253)
    at 
org.w3c.mwi.mobileok.basic.Preprocessor.preprocess(Preprocessor.java:124)
    at 
org.w3c.mwi.mobileok.basic.Tester.getPreprocessorResults(Tester.java:90)
    at org.w3c.mwi.mobileok.basic.Tester.main(Tester.java:202)
Caused by: java.util.concurrent.ExecutionException: 
java.lang.reflect.InvocationTargetException
    at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at 
org.w3c.mwi.mobileok.basic.Preprocessor.extractResourcesAsynchronously(Preprocessor.java:248)
    ... 3 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown 
Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.w3c.mwi.mobileok.basic.Preprocessor$2.call(Preprocessor.java:233)
    at org.w3c.mwi.mobileok.basic.Preprocessor$2.call(Preprocessor.java:1)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown 
Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
*Caused by: java.lang.IndexOutOfBoundsException: off < 0 || len < 0 || 
off+len > b.length || off+len < 0!
    at javax.imageio.stream.MemoryCacheImageInputStream.read(Unknown Source)
    at com.sun.imageio.plugins.gif.GIFImageReader.getCode(Unknown Source)
    at com.sun.imageio.plugins.gif.GIFImageReader.read(Unknown Source)
    at javax.imageio.ImageIO.read(Unknown Source)
    at javax.imageio.ImageIO.read(Unknown Source)
    at 
org.w3c.mwi.mobileok.basic.HTTPImageResource.checkTransparency(HTTPImageResource.java:149)*
    at 
org.w3c.mwi.mobileok.basic.HTTPImageResource.checkGIFValidity(HTTPImageResource.java:139)
    at 
org.w3c.mwi.mobileok.basic.HTTPImageResource.<init>(HTTPImageResource.java:53)
    ... 11 more

Thank you !
guido.