(function($){
	$.responsiveSwitch = function(
		responsiveCurrentFlag, 
		mediaScreenMaxWidth, 
		callback 
	){
		var 
		eleWindow = $(window), 
		cssWidthWindow = eleWindow.width();
		if(
			responsiveCurrentFlag === 'pc' && 
			cssWidthWindow < mediaScreenMaxWidth 
		){
			responsiveCurrentFlag = 'sp';
			callback(responsiveCurrentFlag);
		}else 
		if(
			responsiveCurrentFlag === 'sp' && 
			cssWidthWindow >= mediaScreenMaxWidth 
		){
			responsiveCurrentFlag = 'pc';
			callback(responsiveCurrentFlag);
		}else 
		if(responsiveCurrentFlag === ''){
			responsiveCurrentFlag = cssWidthWindow >= mediaScreenMaxWidth?'pc':'sp';
			callback(responsiveCurrentFlag);
		}
	};
})(jQuery);