function set_header_position() {
  var newHeight;
  var left_menu_div = document.getElementById('menudiv').clientHeight;
  var main_content_div = document.getElementById('main_content_div').clientHeight;
  var footerDiv = document.getElementById('footer');
  var right_menu_div = document.getElementById('right_menu_div').clientHeight;
  var ad_menu = document.getElementById('ad_menu').clientHeight;

  newHeight = left_menu_div;
  if (main_content_div > newHeight) { newHeight = main_content_div; }
  if (right_menu_div > newHeight) { newHeight = right_menu_div; }
  if (ad_menu > newHeight) { newHeight = ad_menu; }

  footerDiv.style.top = (newHeight + 185 + 45) + "px";
  footerDiv.style.display = "block";
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}