var isIE5=navigator.userAgent.toUpperCase().indexOf("MSIE 5")!=-1;

function adjustHeight() {
  if (document.getElementById) {
      var targetElement=document.getElementById("content"),
          elementOffset=156, styleOffset=0, documentHeight, totalOffset;

      if (targetElement && document.documentElement.offsetHeight
          && targetElement.offsetHeight) {
          documentHeight=document.documentElement.offsetHeight;
          if (targetElement.offsetHeight<documentHeight-elementOffset) {
              if (isIE5)
                  totalOffset=elementOffset;
                  else totalOffset=elementOffset+styleOffset;
              targetElement.style.height=String(documentHeight-totalOffset)+'px';
          }
      }
  }
}

window.onresize=adjustHeight;
window.onload=adjustHeight;