点击imageButton按钮弹出新窗口后主窗口CSS失效？该如何解决

点击imageButton按钮弹出新窗口后主窗口CSS失效？
protected   void   ibtnBrowse_Click(object   sender,   ImageClickEventArgs   e)
{
            string   strCMD   =   Server.UrlEncode( "SELECT, "   +   strResIDS);
            Response.Write( " <script   language= 'javascript '> window.open   ( 'SpecificationPrint.aspx?CMD= "   +   strCMD   +   " ', 'SpecificationShow ', ' '); </script> ");
}
点击根据选择记录弹出新窗口后   主窗口CSS样式   失效了，错在哪里呢？

------解决方案--------------------------------------------------------
不要这样写
Response.Write( " <script language= 'javascript '> window.open ( 'SpecificationPrint.aspx?CMD= " + strCMD + " ', 'SpecificationShow ', ' '); </script> ");

可以这样

Labelxx.Text = ( " <script language= 'javascript '> window.open ( 'SpecificationPrint.aspx?CMD= " + strCMD + " ', 'SpecificationShow ', ' '); </script> ");