function font_size(size){ 

	var cookie = ' '+ document.cookie +';';
	var key = 'showa_v=';
	var i = cookie.indexOf(key);

	if (i != -1){
		i += key.length;
		var cookieValue = unescape(cookie.substring(i, cookie.indexOf(';', i)));
		var value = cookieValue.split(',');

		if (size == 'small'){
			if (value[1] > 1){
				value[1]--;
				set_size(value[0], value[1]);
			}
		}
		else if (size == 'large'){
			if (value[1] < 5){
				value[1]++;
				set_size(value[0], value[1]);
			}
		}
	}
}

function set_size(style, size){ 

	var size_data = {'1':'12', '2':'13', '3':'14', '4':'15', '5':'16'};
	document.getElementById('size_level').src = '/img/style1/comm/btn_size'+ size +'.jpg';
	document.body.style.fontSize = size_data[size] +'px';
	document.cookie = 'showa_v='+ escape(style +','+ size) +';expires=Tue, 1-Jan-2030 00:00:00 GMT;path=/;';
}