// JavaScript Document

window.onload = function() {

var aHeight = document.getElementById("side_navi").clientHeight;
var bHeight = document.getElementById("main_contents").clientHeight;

  if (aHeight > bHeight) {
	  document.getElementById("main_contents").style.height = aHeight-91+'px';
  }
  if (aHeight < bHeight) {
	  document.getElementById("side_navi").style.height = bHeight+'px';
  }

}