pdfs embedded in html files cover drop down menus

I am trying to embed a pdf file in my web page.
Unfortunately, the pdf covers my drop-down menu. I use the and html statements with wmode="transparent" as has been recommended to me, and this works with flash files embedded in my html in a similar manner, but not with pdfs. Can you help me?? I would love to use pdfs in my web page, but will have to drop it if I cannot get the menus to drop down over the pdf.
 
Thanks.