function correct_layout() {
   if(document.getElementById('div_content').offsetHeight) {
      var div_heights = new Array(
        document.getElementById('div_content').offsetHeight,
        document.getElementById('div_navigation').offsetHeight,
        document.getElementById('div_features').offsetHeight
      );
      div_heights = div_heights.reverse(div_heights.sort(num_sort));
      var style_height = div_heights[0] + "px";
      document.getElementById('div_navigation').style.height = style_height;
      document.getElementById('div_content').style.height = style_height;
      document.getElementById('div_features').style.height = style_height;
   }
}
function num_sort(a,b) { 
   return a-b; 
}
function openbigimage(image)
{
    window.open(image, "_blank", "toolbar=no,status=no,menubar=no,resizable=yes");
    return true;
}