var h = 0;
var browser = navigator.appName;

function same_height() {
  if(browser == "Microsoft Internet Explorer") {
    for(i = 1; i < 3; i++) {
      if(document.getElementById("col" + i).offsetHeight > h) 
        h = document.getElementById("col" + i).offsetHeight;
    }
  } else {
    for(i = 1; i < 3; i++) {
      if(document.getElementById("col" + i).clientHeight > h) 
        h = document.getElementById("col" + i).clientHeight;
    }
  }  
  for(i = 1; i < 3; i++) {
    document.getElementById("col" + i).style.height = h + "px";
  }
  document.getElementById("col3").style.height = (h - 16) + "px";

  MM_preloadImages('_images/common/menu_01_on.jpg','_images/common/menu_02_on.jpg','_images/common/menu_03_on.jpg','_images/common/menu_04_on.jpg','_images/common/menu_05_on.jpg','_images/common/menu_06_on.jpg','_images/common/menu_07_on.jpg','_images/common/menu_08_on.jpg','_images/common/menu_09_on.jpg','_images/common/menu_top_01_on.jpg','_images/common/menu_top_02_on.jpg','_images/common/menu_top_03_on.jpg','_images/common/menu_top_04_on.jpg');
}

window.onload = same_height;