var name = "#side3";
var menuYloc = null;
var h_size;

function getBrowserHeight(){
  if(document.all){
    return document.documentElement.clientHeight;
  }else if(document.layers || document.getElementById){
    return innerHeight;
  }
}
function fn_resize(){
  h_size = getBrowserHeight() * 0.7;
  offset = h_size + menuYloc+$(document).scrollTop()+"px";
  $(name).animate({top:offset},{duration:500,queue:false});
}
$(document).ready(function(){
  fn_resize();
});
$(window).scroll(function(){
  offset = h_size + menuYloc+$(document).scrollTop()+"px";
  $(name).animate({top:offset},{duration:500,queue:false});
});
window.onresize = function(){
  fn_resize();
}