// function changeFocus()
//  {
// var field = document.getElementById('cont').focus();
// }

var position = 0;
var color = "#ffffff";

function startPolling(){setInterval("poll()",500)}

function poll(){
if (navigator.appName == "Microsoft Internet Explorer"){var position = document.cont.scrollTop;}
else {var position = cont.pageYOffset;}

if (position > 50  && position < 250){color = "#ff0000";}

if (position > 250 && position < 450){color = "#00ff00";}

if (position > 450 && position < 650){color = "#0000ff";}

if (position > 650 && position < 850){color = "#ffff00";}

if (position > 850 && position < 1050){color = "#c0c0c0";}

if (position > 1050 || position < 50){color = "#ffffff"}

document.bgColor = color;
return true;

}