var ie4 = false;
var ns4 = false;

if (parseInt(navigator.appVersion) >= 4)
  if (navigator.appName == 'Microsoft Internet Explorer')
    ie4 = true;
  else if (navigator.appName == 'Netscape')
    ns4 = true;

if (ie4) {
  onscroll = synchScroll;
  onresize = synchScroll;
  }
if (ns4) setInterval("synchScroll()", 15);

function synchScroll() {
  if (ie4) {
    parent.frames.leftFrame.document.body.scrollTop = document.body.scrollTop;
    parent.frames.leftFrame.document.body.scrollLeft = document.body.scrollLeft;
    }
  else if (ns4) {
    if (parent.frames.leftFrame.scrollbars.visible) {
      parent.frames.leftFrame.scrollTo(parent.frames.leftFrame.pageXOffset, pageYOffset);
      parent.frames.mainFrame.scrollTo(pageXOffset, parent.frames.mainFrame.pageYOffset);
      }
    else {
      parent.frames.leftFrame.document.layers[0].left = -pageXOffset;
      parent.frames.leftFrame.document.layers[0].top = -pageYOffset;
      }
    }
  }