function fontChange(str){
	var targetFile;
	switch(str){
	case "small":
		targetFile="/css/font-small.css";
		break;
	case "medium":
		targetFile="/css/font-middle.css";
		break;
	case "large":
		targetFile="/css/font-large.css";
		break;
	default:
		alert("error");
		break;
	}

	document.cookie="fontstyle="+targetFile+";path=/;";
	window.location.reload();
}


var name = "fontstyle";
var cookie = document.cookie;
if(-1 == cookie.indexOf(name) ){
	var file = '/css/font-middle.css';
}else{
	var pos_s = cookie.indexOf(name) + name.length + 1;
	var pos_e = cookie.indexOf(";", pos_s);
	if(-1 == pos_e){
		var file = cookie.slice(pos_s);
	}else{
		var file = cookie.slice(pos_s, pos_e);
	}
}
document.write('<link rel="stylesheet" type="text/css" href="'+file+'" />');