changing param name="movie" and embed src=

[RANEX]

i have 40 files flashpaper in virtual server and i need change the source file of object flashpaper in the webpage ,,,,with a determinate selection of client from <asp:DropDownList

the values of pathname and filename set in <asp:DropDownList.selecteditem.value

how can i change the object FlashPaper (param name="movie" and embed src=) in code asp.net or javascript php or vbscript???????????

thanks