http://forums.asp.net/t/1202954.aspx
http://www.velocityreviews.com/forums/t21131-aspnet-page-load-twice-problem.html
<img src="" alt="" />
The problem was with the <asp:Image> control.
Or problem like this.
<TD valign="bottom" align="left" background="#B6C8DE">
bgColor, not background