//
// main.js
//

function scroll() {
  var $banner = $("#banner");
  var scroll = $(document).scrollTop();
  var rightOffset = $("#rightColumn").offset().top;
  var position;
  
  if (scroll > rightOffset - 10) {
    var rightHeight = $("#rightColumn").outerHeight();
    if (scroll > rightOffset + rightHeight) {
      position = scroll + 15;
    } else {
      position = rightOffset + rightHeight;
    }
  } else {
    position = 15;
  }
  
  $banner.stop();
  $banner.animate({top: position}, 200, "linear");
}

$(document).ready(function() {
  
  setInterval("scroll()", 100);
  
});