function winH() {
	if (window.innerHeight) return window.innerHeight;
	else if (document.documentElement && document.documentElement.clientHeight)
		return document.documentElement.clientHeight;
	else if (document.body && document.body.clientHeight)
		return document.body.clientHeight;
	else return null;
}


function setPageHeight() {
  var height = winH();
  var page = document.getElementById('page');
  if (!pageHeight) {
    pageHeight = page.offsetHeight;
  }
  if (pageHeight < height) {
    page.style.height = height + 'px';
  }
}

var pageHeight;
window.onload = setPageHeight;
window.onresize= setPageHeight;