Limit a DIV to Certain Scroll Height

<!DOCTYPE HTML>
<html>
<style type="text/css">

#fixbot {
bottom:0px;
position: fixed;
}

#fixright {
right:0px;
position: absolute;
}

#fixtop {
top:0px;
position: fixed;
}

</style>

<script>

var offset;

window.onscroll = function() {

 if (typeof(window.pageYOffset) == 'number') {
  offset = window.pageYOffset;
 }
 else if (document.documentElement) {
  offset = document.documentElement.scrollTop;
 }
 else if (document.body) {
  offset = document.body.scrollTop;
 }
 if (offset > 170) {
  document.getElementById('fixright').style.position = 'fixed';
  document.getElementById('fixright').style.top = '170px';
 }
 else {
  document.getElementById('fixright').style.position = 'absolute';
  document.getElementById('fixright').style.top = '50%';
 }
 document.getElementById('notice').innerHTML = offset;
}

</script>

<body bgcolor="#aabbcc" marginheight=0 marginwidth=0 leftmargin=0 topmargin=0 rightmargin=0 bottommargin=0 onload="window.scrollTo(0,0);">

<div id="fixbot" style="border:0px solid #333; width:100%; height:50px; background-color:#ddd; text-align:center; padding:0px; ">
<p>Hello I am at the bottom!</p>
</div>

<div id="fixright" style="border:0px; width:100px; height:200px; text-align:center; padding:0px; top: 50%; margin-top: -100px; background-color:#cba;">
<table width=100% height=100%><tr><td valign=middle><p>Right!</p></td></tr></table>
</div>

<div id="fixtop" style="border:0px solid #333; width:100%; height:70px; background-color:#ddd; text-align:center; padding:0px; "> <p>Hello I am at the top! <span id="notice"></span></p>
</div>

<table width="95%" align=center><tr><td>
<br>line 1<br>line 2<br>line 3<br>line 4<br>line 5<br>line 6<br>line 7<br>line 8<br>line 9<br>line 10 <br>line 11<br>line 12<br>line 13<br>line 14<br>line 15<br>line 16<br>line 17<br>line 18<br>line 19<br>line 20 <br>line 21<br>line 22<br>line 23<br>line 24<br>line 25<br>line 26<br>line 27<br>line 28<br>line 29<br>line 30 <br>line 31<br>line 32<br>line 33<br>line 34<br>line 35<br>line 36<br>line 37<br>line 38<br>line 39<br>line 40 <br>line 41<br>line 42<br>line 43<br>line 44<br>line 45<br>line 46<br>line 47<br>line 48<br>line 49<br>line 50 <br>line 51<br>line 52<br>line 53<br>line 54<br>line 55<br>line 56<br>line 57<br>line 58<br>line 59<br>line 60 <br>line 61<br>line 62<br>line 63<br>line 64<br>line 65<br>line 66<br>line 67<br>line 68<br>line 69<br>line 70<br>line 71<br>line 72<br>line 73<br>line 74<br>line 75<br>line 76<br>line 77<br>line 78<br>line 79<br>line 80 </td></tr></table>

<script>
setTimeout(function() {window.scrollTo(0, 0);},100); // To make sure when the page is reloaded, the scroll is back to 0
document.getElementById('fixright').style.top = '50%';

</script>

</body>
</html>