this is the java error console message that shows up. The image use to open before but now its not opening.

Java Plug-in 1.6.0_18
Using JRE version 1.6.0_18-b07 Java HotSpot(TM) Client VM
User home directory = C:\Users\PRERAK
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------


AstexViewer 3.0.99
Copyright (C) 1999-2008 Astex Therapeutics Ltd.
http://www.astex-therapeutics.com/AstexViewer
about to close property file
host = [www.dockingserver.com]
documentbase = [http://www.dockingserver.com/web/docking/43657/]
codebase = [http://www.dockingserver.com/]
java.lang.NegativeArraySizeException
at astex.Molecule.connect2(Molecule.java:836)
at astex.MoleculeIO.readPDB(MoleculeIO.java:1019)
at astex.MoleculeIO.read(MoleculeIO.java:213)
at astex.MoleculeIO.read(MoleculeIO.java:178)
at MoleculeViewerApplet.initialiseApplet(MoleculeViewerApplet.java:305)
at MoleculeViewerApplet.run(MoleculeViewerApplet.java:154)
at MoleculeViewerApplet.init(MoleculeViewerApplet.java:61)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NegativeArraySizeException
AstexViewer 3.0.99
Copyright (C) 1999-2008 Astex Therapeutics Ltd.
http://www.astex-therapeutics.com/AstexViewer
about to close property file
host = [www.dockingserver.com]
documentbase = [http://www.dockingserver.com/web/docking/44855/]
codebase = [http://www.dockingserver.com/]
java.lang.NegativeArraySizeException
at astex.Molecule.connect2(Molecule.java:836)
at astex.MoleculeIO.readPDB(MoleculeIO.java:1019)
at astex.MoleculeIO.read(MoleculeIO.java:213)
at astex.MoleculeIO.read(MoleculeIO.java:178)
at MoleculeViewerApplet.initialiseApplet(MoleculeViewerApplet.java:305)
at MoleculeViewerApplet.run(MoleculeViewerApplet.java:154)
at MoleculeViewerApplet.init(MoleculeViewerApplet.java:61)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NegativeArraySizeException

This error sounds like that the current version of this Java applet and the stored version in your browser cache differs. Please first try it out in a different web browser you generally use - it should work there. If it works, clean the cache of your favorite web browser (delete temporary internet files). This should resolve your issue.

Zsolt