how to embed different swf movies dynamically

I am developing a web site with .net and there is a page named loadanymovie.aspx

I want to call the swf movie file name dynamically by code (by querystring, such as  : www.mysite.com/loadanymovie.aspx?moviename=1)

i used following code for this :

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If Len(Request.QueryString("st")) > 0 Then

            firmasec.Items.FindByValue(Request.QueryString("st").ToString).Selected = True

            Dim lc As New LiteralControl

            lc.Text = "<embed align=""middle"" allowfullscreen=""false"" allowscriptaccess=""sameDomain"" bgcolor=""#333333""" + _

                      "  height=""700"" name=""main1004"" pluginspage=""http://www.adobe.com/go/getflashplayer""" + _

                      "  quality=""high"" src=""swfs/" + Request.QueryString("moviename").ToString + ".swf" + """ type=""application/x-shockwave-flash"" width=""1000""></embed>"

            PlaceHolder1.Controls.Add(lc)

        Else

        End If

    End Sub

this code works and doesnt produce any error. But i cannot see the movie at internet explorer. (i can see it at chrome browser)

any idea?