$.widget( "ui.seasons", {

    options: {
        outhum : 'background-outhum',
        spring : 'background-spring',
        summer : 'background-summer',
        winter : 'background-winter'
    },

    _create: function()
    {
        var date = new Date();
        this.doChange( date.getMonth() );
    },
    
    doChange: function(month){
        switch(month) {
            //зима
            case 11:
            case 0:
            case 1: {
                this.element.addClass(this.options.winter);
                break;
            }
            //весна
            case 2:
            case 3:
            case 4: {
                this.element.addClass(this.options.spring);
                break;
            }
            //лето
            case 5:
            case 6:
            case 7: {
                this.element.addClass(this.options.summer);
                break;
            }
            //осень
            case 8:
            case 9:
            case 10: {
                this.element.addClass(this.options.outhum);
                break;
            }
        }
        //
    }

} );


$(document).ready(function(){
    $('.ui-seasons').seasons();
});