function isSmartPhone(){
	var agent = navigator.userAgent;
	if(agent.indexOf('Linux; U; Android ') != -1 || agent.indexOf('iPhone; U') != -1) {
		return true;
	}
	return false;
}
$(function(){	
	$("div#brand-bnr img").each(function(){
	var img_w = $(this).attr("width");
	var img_h = $(this).attr("height");
	if(img_w > 320){
		var detect_h = Math.floor(img_h * (300 / img_w)) + "px";
		$(this).css({width:"300px", height:detect_h});
	}
	});
});