/**
 * SWFMacMouseWheel v1.0: Mac Mouse Wheel functionality in flash - http://blog.pixelbreaker.com/
 *
 * SWFMacMouseWheel is (c) 2006 Gabriel Bucknall and is released under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Dependencies: 
 * SWFObject v2.0 - (c) 2006 Geoff Stearns.
 * http://blog.deconcept.com/swfobject/
 */
function SWFMacMouseWheel( swfObject )
{
        this.so = swfObject;
        var isMac = navigator.appVersion.toLowerCase().indexOf( "mac" ) != -1;
        if( isMac ) this.init();
}


SWFMacMouseWheel.prototype = {
        init: function()
        {
                SWFMacMouseWheel.instance = this;
                if (window.addEventListener)
                {
                window.addEventListener('DOMMouseScroll', SWFMacMouseWheel.instance.wheel, false);
                }
                window.onmousewheel = document.onmousewheel = SWFMacMouseWheel.instance.wheel;
        },
        
        handle: function( delta )
        {
                document[ this.so.getAttribute('id') ].externalMouseEvent( delta );
        },


        wheel: function(event){
        var delta = 0;
        if (event.wheelDelta) { /* IE/Opera. */
                        delta = event.wheelDelta/120;
                        if (window.opera) delta = -delta;
        } else if (event.detail) { /** Mozilla case. */
            delta = -event.detail/3;
        }
        if( /AppleWebKit/.test(navigator.userAgent) ) {
                delta /= 3;     
        }
        /** If delta is nonzero, handle it.
         * Basically, delta is now positive if wheel was scrolled up,
         * and negative, if wheel was scrolled down.
         */
        if (delta)
               SWFMacMouseWheel.instance.handle(delta);
        /** Prevent default actions caused by mouse wheel.
         * That might be ugly, but we handle scrolls somehow
         * anyway, so don't bother here..
         */
        if (event.preventDefault) event.preventDefault();
                event.returnValue = false;
        }
};