Ok, jamen jeg har modificeret lidt i din kode, denne skulle virke for dig!
<object ID=\"NSPlay\" WIDTH=\"128\" HEIGHT=\"88\" classid=\"CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95\" codebase=\"
http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701\" standby=\"Henter video software til din computer...\" type=\"application/x-oleobject\" VIEWASTEXT>
<param NAME=\"FileName\" VALUE=\"din sti til avi\'en\">
<param NAME=\"ShowControls\" VALUE=\"0\">
<param NAME=\"ShowDisplay\" VALUE=\"0\">
<param NAME=\"ShowStatusBar\" VALUE=\"0\">
<param NAME=\"AutoSize\" VALUE=\"0\">
<embed type=\"application/x-mplayer2\" pluginspage=\"
http://www.microsoft.com/Windows/Downloads/Contents/Products/MediaPlayer/\" filename=\"sti.asx\" src=\"sti.asx\" Name=\"NSPlay\" ShowControls=\"1\" ShowDisplay=\"1\" ShowStatusBar=\"1\" width=\"160\" height=\"120\">
</object>