PlugIn for Embed PDF

Hi all!

I hope anybody can help me!

I have added a PlugIn for embed PDF.
It generates the following html-code:
<object height="700" width="500" type="application/pdf" data="test.pdf"></object>

Question 1:
This code works fine, but the editor don't show the PDF. The editor shows a
white picture with a centered green puzzle.
What could be the reason for this?
Is there a workaround to solve the problem?

Question 2:
i have tried to combine the object and embed tag:
<object height="700" width="500" type="application/pdf" data="test.pdf">
<embed height="700" width="500" src="test.pdf"></embed></object>

This code works fine in Firefox, but in IE I'm not able to add the embed-tag inside of the object-tag.
Does anybody have an idea to solve this problem?

Thanks in advance!

Best regards,
Stephan Ederer