if (parseInt(navigator.appVersion)>3) {
  if (navigator.appName=="Netscape") {
    document.getElementById('mainContent').style.height = window.innerHeight;
  }
  if (navigator.appName.indexOf("Microsoft")!=-1) {
    document.getElementById('mainContent').style.height = document.body.offsetHeight;
  }
}
if (parseInt(navigator.appVersion)>3) {
  if (navigator.appName=="Netscape") {
    document.getElementById('culibuli').style.height = window.innerHeight;
  }
  if (navigator.appName.indexOf("Microsoft")!=-1) {
    document.getElementById('culibuli').style.height = document.body.offsetHeight;
  }
}