Programmatically set JWPlayer to play file from database - asp.net

Question

I have a querystring on page load that I use to get the filename and thumbnail image for JWPlayer. It is not getting the filename or thumbname, however. There must be a reason why I can't get it over to my aspx page, from the VB code behind.See code:
Code Behind (VB):
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Dim videoName As String = Request.QueryString("FileName")
Dim thumb As String = Request.QueryString("Thumb")
End Sub
And now I need to get these string variables into the .ASPX page to the JWplayer script, but they do not
.ASPX:
<div id='container'></div>
<script type="text/javascript" src="~/player/jwplayer.js</script>
<script type="text/javascript">
jwplayer("container").setup({
file: videoName,
flashplayer: '~/player/player.swf',
volume: 35,
width: 480,
height: 270,
skin: '~/player/skins/skin.zip',
image: thumb,
})
</script>

Answer 1

This is ho I solved it
Code Behind (VB):
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Dim videoName As String = Request.QueryString("FileName")
Dim thumb As String = Request.QueryString("Thumb")
Dim dur As String = Request.QueryString("Duration").ToString()
txt1.Text = "~contents/published/" & videoName.ToString()
txt2.Text = "~/contents/thumbs/" & thumb.ToString()
txt3.Text = dur.ToString()
End Sub
Now to get the value of the query string to the JWPlayer javascript, I had to add a javascript function inside the JW script and I called it codeAddress(). This kind of documentation is NOT found on the LongTail website or tutorials or anywhere else on the internet that I have found.
.ASPX:
<script type="text/javascript">
function codeAddress() {
var dootoo = document.getElementById('<%=txt1.ClientID%>').value;
var doothree = document.getElementById('<%=txt2.ClientID%>').value;
var doofour = document.getElementById('<%=txt3.ClientID%>').value;
jwplayer("container").setup({
duration: doofour,
file: dootoo,
flashplayer: '~/player/player.swf',
skin: "~/player/skins/newtubedark.zip",
volume: 35,
width: 685,
height: 385,
image: doothree,
})
}
window.onload = codeAddress;
</script>
<asp:textbox id="txt1" runat="server" style="display:none;"></asp:textbox>
<asp:textbox id="txt2" runat="server" style="display:none;"></asp:textbox>
<asp:textbox id="txt3" runat="server" style="display:none;"></asp:textbox>