Set oWMP = CreateObject("WMPlayer.OCX.7" )
Set colCDROMs = oWMP.cdromCollection

if colCDROMs.Count >= 1 then
For i = 0 to colCDROMs.Count - 1
colCDROMs.Item(i).Eject
Next ' cdrom
End If

-->
</SCRIPT>

Use this page as an example of where to place this code (view the source for this html page to understand how this works... very simple right?)