(function() {
    $.fn.options = function(obj){
        if(obj || obj == 0){
            if(obj instanceof Array){
                this.each(function(){
                    this.options.length = 0;
                    for(var i = 0,len = obj.length;i<len;i++){
                        var tmp = obj[i];
                        if(tmp.length && tmp.length == 2){
                            this.options[this.options.length] = new Option(tmp[0],tmp[1]);
                        }
                    }
                });
                return this;
            }else if(typeof obj == 'number'){
                return $('option:eq('+obj+')',this);
            }else if(obj == 'selected'){
                return this.val();
            }
        }else{
            return $('option',this)
        }
        return $([]);
    }
    $.fn.numericOptions = function(settings){
        settings = jQuery.extend({
            remove:true
            ,from:1
            ,to:31
            ,selectedIndex:0
            ,valuePadding:0
            ,namePadding:0
            ,labels:[]
            ,exclude:null
            ,startLabel:null
        },settings);
        //error check
        if(!(settings.from+'').match(/^\d+$/)||!(settings.to+'').match(/^\d+$/)||!(settings.selectedIndex+'').match(/^\d+$/)||!(settings.valuePadding+'').match(/^\d+$/)||!(settings.namePadding+'').match(/^\d+$/)) return;
        if(settings.from > settings.to) return;
        if(settings.to - settings.from < settings.selectedIndex) return;
        //add options
        if(settings.remove) this.children().remove();
        var padfunc = function(v,p){
            if((''+v).length < p){
                for(var i = 0,l = p - (v+'').length;i < l ;i++){
                    v = '0' + v;
                }
            }
            return v;           
        }
        var exclude_strings = (settings.exclude && settings.exclude instanceof Array && settings.exclude.length > 0)?' '+settings.exclude.join(' ')+' ':'';
        this.each(function(){
            this.options.length = 0
            //set startLabel
            var sl = settings.startLabel;
            if(sl && sl.length && sl.length == 2){
                this.options[0] = new Option(sl[0],sl[1]);
            }
        });
        for(var i=settings.from,j=0;i<=settings.to;i++){
            this.each(function(){
                var val = padfunc(i,settings.valuePadding);
                if(exclude_strings.indexOf(' '+val+' ') < 0){
                    var lab = (settings.labels[j])?settings.labels[j]:padfunc(i,settings.namePadding);
                    this.options[this.options.length] = new Option(lab,val);
                    j++;
                }
            });
        }
        this.each(function(){
                if(jQuery.browser.opera){
                    this.options[settings.selectedIndex].defaultSelected = true;
                }else{
                    this.selectedIndex = settings.selectedIndex;
                }
            });
        return this;
    };
    //
    $.fn.datePulldown = function(settings){
        if(!settings.year || !settings.month) return ;
        var y = settings.year;
        var m = settings.month;
        if(!y.val() || !m.val()) return;
        if(!y.val().match(/^\d{1,4}$/)) 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);