function winH()
{
   if (window.innerHeight) // NN4 a kompatibiln? prohl??e?e 
       return window.innerHeight;
   else if (document.documentElement && document.documentElement.clientHeight) // MSIE6 v std. re?imu - Opera a Mozilla s window.innerHeight
      return document.documentElement.clientHeight;
   else if (document.body && document.body.clientHeight) // star?? MSIE + MSIE6 v quirk re?imu 
      return document.body.clientHeight;
   else
      return null;
}
var yres = winH()-35;
document.write('<div style="height:'+yres+'px">Konec stránky. <small><a href="#">Návrat nahoru</a></small></div>');