breaker.js

// ==================================================
// Active media query listener / breakpoint manager
// @depends: Modernizr
// ==================================================
var breaker = function( breakpoints ) {
        var exec = []
	, self = this;
	if (typeof breakpoints !== 'object') return false;

	self.test = function() {
		for ( point in breakpoints ) {
			// On
			if ( exec.indexOf( point ) === -1 && Modernizr.mq( point ) ) {
				if ( typeof breakpoints[point].on === 'function' ) {
					breakpoints[point].on();
				}
				exec.push( point );
			}

			// Off
			if ( exec.indexOf( point ) > -1 && !Modernizr.mq( point ) ) {
				if ( typeof breakpoints[point].off === 'function' ) {
					breakpoints[point].off();
				}
				exec.splice( (exec.indexOf( point )), 1 );
			}
		}
	};

	window.onresize = function() {
		self.test();
	};

	self.test();
}