(function($) {
    
    //If the UI scope is not available, add it
    $.ui = $.ui || {};
    
    //Add methods that are vital for all mouse interaction stuff (plugin registering)
    $.extend($.ui, {
        plugin: {
            add: function(module, option, set) {
                var proto = $.ui[module].prototype;
                for(var i in set) {
                    proto.plugins[i] = proto.plugins[i] || [];
                    proto.plugins[i].push([option, set[i]]);
                }
            },
            call: function(instance, name, arguments) {
                var set = instance.plugins[name]; if(!set) return;
                for (var i = 0; i < set.length; i++) {
                    if (instance.options[set[i][0]]) set[i][1].apply(instance.element, arguments);
                }
            }   
        },
        cssCache: {},
        css: function(name) {
            if ($.ui.cssCache[name]) return $.ui.cssCache[name];
            
            var tmp = $('<div class="ui-resizable-gen">').addClass(name).css(
                {position:'absolute', top:'-5000px', left:'-5000px', display:'block'}
            ).appendTo('body');
            
            //Opera and Safari set width and height to 0px instead of auto
            //Safari returns rgba(0,0,0,0) when bgcolor is not set
            $.ui.cssCache[name] = !!(
                ((/^[1-9]/).test(tmp.css('height')) || (/^[1-9]/).test(tmp.css('width')) || 
                !(/none/).test(tmp.css('backgroundImage')) || !(/transparent|rgba\(0, 0, 0, 0\)/).test(tmp.css('backgroundColor')))
            );
            try { $('body').get(0).removeChild(tmp.get(0)); } catch(e){}
            return $.ui.cssCache[name];
        },
        disableSelection: function(e) {
            if (!e) return;
            e.unselectable = "on";
            e.onselectstart = function() {  return false; };
            if (e.style) e.style.MozUserSelect = "none";
        },
        enableSelection: function(e) {
            if (!e) return;
            e.unselectable = "off";
            e.onselectstart = function() { return true; };
            if (e.style) e.style.MozUserSelect = "";
        }
    });
    
    /********************************************************************************************************/

    $.fn.extend({
        mouseInteraction: function(o) {
            return this.each(function() {
                new $.ui.mouseInteraction(this, o);
            });
        },
        removeMouseInteraction: function(o) {
            return this.each(function() {
                if($.data(this, "ui-mouse"))
                    $.data(this, "ui-mouse").destroy();
            });
        }
    });
    
    /********************************************************************************************************/
    
    $.ui.mouseInteraction = function(element, options) {
    
        var self = this;
        this.element = element;
        $.data(this.element, "ui-mouse", this);
        this.options = $.extend({}, options);
        
        $(element).bind('mousedown.draggable', function() { return self.click.apply(self, arguments); });
        if($.browser.msie) $(element).attr('unselectable', 'on'); //Prevent text selection in IE
        
    };
    
    $.extend($.ui.mouseInteraction.prototype, {
        
        destroy: function() { $(this.element).unbind('mousedown.draggable'); },
        trigger: function() { return this.click.apply(this, arguments); },
        click: function(e) {
            
            if(
                   e.which != 1 //only left click starts dragging
                || $.inArray(e.target.nodeName.toLowerCase(), this.options.dragPrevention) != -1 // Prevent execution on defined elements
                || (this.options.condition && !this.options.condition.apply(this.options.executor || this, [e, this.element])) //Prevent execution on condition
            ) return true;
            
            var self = this;
            var initialize = function() {
                self._MP = { left: e.pageX, top: e.pageY }; // Store the click mouse position
                $(document).bind('mouseup.draggable', function() { return self.stop.apply(self, arguments); });
                $(document).bind('mousemove.draggable', function() { return self.drag.apply(self, arguments); });
            };

            if(this.options.delay) {
                if(this.timer) clearInterval(this.timer);
                this.timer = setTimeout(initialize, this.options.delay);
            } else {
                initialize();
            }
            
            return false;
            
        },
        stop: function(e) {         
            
            var o = this.options;
            if(!this.initialized) return $(document).unbind('mouseup.draggable').unbind('mousemove.draggable');

            if(this.options.stop) this.options.stop.call(this.options.executor || this, e, this.element);
            $(document).unbind('mouseup.draggable').unbind('mousemove.draggable');
            this.initialized = false;
            return false;
            
        },
        drag: function(e) {

            var o = this.options;
            if ($.browser.msie && !e.button) return this.stop.apply(this, [e]); // IE mouseup check
            
            if(!this.initialized && (Math.abs(this._MP.left-e.pageX) >= o.distance || Math.abs(this._MP.top-e.pageY) >= o.distance)) {
                if(this.options.start) this.options.start.call(this.options.executor || this, e, this.element);
                this.initialized = true;
            } else {
                if(!this.initialized) return false;
            }

            if(o.drag) o.drag.call(this.options.executor || this, e, this.element);
            return false;
            
        }
    });

 })(jQuery);