function addLoadEvent(func)
	{
		if(typeof window.addEventListener == 'function')
		{
		window.addEventListener('load', func, false);
		return true;
	 	}
	 	else if(typeof window.attachEvent == 'object')
	 	{
			window.attachEvent('onload', func);
			return true;
		}
	}

	function myGetHeightTop()
	{
		var resultMaxNum = '';
		var ret = new Array(3);
		var classNm = new Array('side', 'maintd', 'side_right');
		
		var leftbox    = $(classNm[0]);
		var centertbox = $(classNm[1]);
		var rightbox   = $(classNm[2]);
		
		ret[0] = Element.getHeight(leftbox);		// ��
		ret[1] = Element.getHeight(centertbox);		// ����
		ret[2] = Element.getHeight(rightbox);		// �E
		
		resultMaxNum = Math.max(ret[0], ret[1]);
		resultMaxNum = Math.max(ret[2], resultMaxNum);
		
		for( var i=0; i<ret.length; i++ ){
			if( ret[i] != resultMaxNum ){
				document.getElementById(classNm[i]).style.height = resultMaxNum+"px";
			}
		}
	}

	function myGetHeightOther()
	{
		var resultMaxNum = '';
		var ret = new Array(2);
		var classNm = new Array('side', 'maintd');
		
		var leftbox    = $(classNm[0]);
		var rightbox   = $(classNm[1]);
		
		ret[0] = Element.getHeight(leftbox);		// ��
		ret[1] = Element.getHeight(rightbox);		// �E
		
		if( ret[0] > ret[1] ){
			document.getElementById(classNm[1]).style.height = ret[0]+"px";
		} else {
			document.getElementById(classNm[0]).style.height = ret[1]+"px";
		}
	}