(function() {  

	//
	$.fn.datePulldown = function(settings){
		if(!settings.year || !settings.month) return ;
		var y = settings.year;
		var m = settings.month;
		if(!y.val() || !m.val()) return;
		if(!y.val().match(/^\d{1,4}$/)) return;
		if(!m.val().match(/^[0][1-9]$|^[1][1,2]$|^[0-9]$/)) return;

		var self = this;
		var fnc = function(){
			var tmp = new Date(new Date(y.val(),m.val()).getTime() - 1000);
			var lastDay = tmp.getDate() - 0;
			self.each(function(){
				var ind = (this.selectedIndex<lastDay-1)?this.selectedIndex:lastDay-1;
				this.selectedIndex = ind;
				$(this).numericOptions({to:lastDay,selectedIndex:ind});
			});
		}
		y.change(fnc);
		m.change(fnc);
		return this;	
	};
})(jQuery);