Kontakt.breakpoints = {
    sizes: {
        'xs': 480,
        'sm': 768,
        'md': 992,
        'lg': 1200
    },
    queries: {
        'upTo': function( to ) {
            var _to = this.sizes[to];
            return 'only screen and (max-width:' + _size + 'px)';
        },
        'between': function( from, to ) {
            var _from = this.sizes[from];
            var _to = this.sizes[to];
            return 'only screen and (min-width:' + _from + 'px) and (max-width:' + (_to - 1) + 'px)';
        },
        'greaterThan': function( from ) {
            var _from = this.sizes[from];
            return 'only screen and (min-width:' + _from + 'px)';
        }
    }
};