//copyright 2008 Jarrett Vance
//http://jvance.com
jQuery.fn.rater = function(options)
 {
    var opts = jQuery.extend({}, jQuery.fn.rater.defaults, options);
    return this.each(function() {
        var $this = jQuery(this);
        var $on = $this.find('.ui-rater-starsOn');
        var $off = $this.find('.ui-rater-starsOff');
        opts.size = $on.height();
        if (opts.rating == undefined) opts.rating = $on.width() / opts.size;
        if (opts.id == undefined) opts.id = $this.attr('id');

        $off.mousemove(function(e) {
            var left = e.clientX - $off.offset().left;
            var width = $off.width() - ($off.width() - left);
            width = Math.ceil(width / (opts.size / opts.step)) * opts.size / opts.step;
            $on.width(width);
        }).hover(function(e) { $on.addClass('ui-rater-starsHover'); }, function(e) {
            $on.removeClass('ui-rater-starsHover'); $on.width(opts.rating * opts.size);
        }).click(function(e) {
            var r = Math.round($on.width() / $off.width() * (opts.units * opts.step)) / opts.step;
            $off.unbind('click').unbind('mousemove').unbind('mouseenter').unbind('mouseleave');
            $off.css('cursor', 'default'); $on.css('cursor', 'default');
            jQuery.fn.rater.rate($this, opts, r);
        }).css('cursor', 'pointer'); $on.css('cursor', 'pointer');
    });
};

jQuery.fn.rater.defaults = {
    postHref: location.href,
    units: 5,
    step: 1
};

jQuery.fn.rater.rate = function($this, opts, rating) {
    var $on = $this.find('.ui-rater-starsOn');
    var $off = $this.find('.ui-rater-starsOff');
    $off.fadeTo(600, 0.4, function() {
        jQuery.ajax({
            url: opts.postHref,
            type: "POST",
            data: 'rating=' + rating,
            complete: function(req) {
                if (req.status == 200) { //success
                    opts.rating = parseFloat(req.responseText);
                    $off.fadeTo(600, 0.1, function() {
                        //$on.removeClass('ui-rater-starsHover').width(opts.rating * opts.size);                        
                        jQuery('#rate').text(req.responseText);                        
                        $off.fadeTo(600, 1);                        
                    });
                } else { //failure
                    alert(req.responseText);
                    $on.removeClass('ui-rater-starsHover').width(opts.rating * opts.size);
                    $this.rater(opts);
                    $off.fadeTo(2200, 1);
                }
            }
        });
    });
};