visad jar

i have a visad application which works fine as an applet when i put the
visad.jar file in the applet tag. when i added another achive file to it
like shown below:


<HTML><BODY> 
<APPLET CODE="Vasxpro.class" ARCHIVES="visad.jar,classes.jar"  WIDTH=700
HEIGHT=500 MAYSCRIPT> 
</APPLET> 
</BODY></HTML>

i get an error which says:

java.lang.NoClassDefFoundError: visad/DisplayImpl
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Unknown Source)
        at sun.applet.AppletPanel.createApplet(Unknown Source)
        at sun.applet.AppletPanel.runLoader(Unknown Source)
        at sun.applet.AppletPanel.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

when i remove classes .jar, it works fine, is there something that i am
missing?  i need som help on this

thanks

Isaac