Java SE (Java Platform, Standard Edition)

I have an Applet for Rich Text Editing which works fine on Windows IE and NN. But the same Applet when called from a Safari OR IE browser on Mac X gives a problem.
On Safari its displaying a small blue color cube instead of my Editor and on IE its just displaying a blank page.
I m new to Mac. I even don't know where should i see what the error is.
Also the Mac m/c is a client m/c.
I tried calling the HTML page that calls the Applet from a different m/c in Network as well as calling the same code after copying on Desktop, but no way it is displaying the Applet.
Plz. help me out ASAP, as I cannot Test it further unless it is displayed and I need to submit it soon and I don't know anything about Mac.

Waiting for Help.
Kind Regards,
Rupali