var x,y;
if (self.innerHeight) // all except Explorer
{
      x = self.innerWidth;
	y = self.innerHeight;
}
else if (document.documentElement && document.documentElement.clientHeight)
	// Explorer 6 Strict Mode
{
	x = document.documentElement.clientWidth;
	y = document.documentElement.clientHeight;
}
else if (document.body) // other Explorers
{
	x = document.body.clientWidth;
	y = y;
}


    function stopClock() {
     window.clearTimeout(timerID);
     if (x >= 900) {
     document.campicture1.src = "graphics/please_reload.gif";
     document.campicture2.src = "graphics/please_reload.gif";
     }
     else if (x <= 900) {
     document.campicture1.src = "graphics/please_reload_small.gif";
     document.campicture2.src = "graphics/please_reload_small.gif";
    }     
    }