ASP.NET

var top = $('#txtTextBoxId').offset().top;
var left= $('#txtTextBoxId').offset().left;

<object classid="clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6" id="Player1">

        <param name="URL" value="http://localhost/Music.wmv">

        <param name="http://path_to_the_video">

        <param name="AutoStart" value="1">

        <param name="ShowControls" value="1">

        <param name="ShowStatusBar" value="1">

        <param name="ShowDisplay" value="1">

        <param name="stretchToFit" value="1">

        <embed runat="Server" id="embed1" type="application/x-mplayer2"

pluginspage="http://www.microsoft.com/Windows/Downloads/Contents/MediaPlayer/" 

width="424" height="379" 

 autostart="1" showcontrols="1" showstatusbar="1">

</embed>

</object>

protected void DataList1_ItemCommand1(object source, DataListCommandEventArgs e)
   {
       try
       {
           if (e.CommandName == "select")
           {
               embed1.Attributes.Add("src", @"http://~/Uploads4/");
               embed1.Attributes.Add("filename", Server.MapPath(e.CommandArgument.ToString()));
               this.modal1.Show();
           }
       }
       catch (Exception ex)
       {
           Response.Write(ex.ToString());
       }

   }