if(navigator.userAgent.indexOf("Mac")>-1) {
	if(navigator.userAgent.match("MSIE")) document.attachEvent("onmousewheel", externalScroll);
    if(navigator.userAgent.match("Gecko")) document.addEventListener("DOMMouseScroll", externalScroll, false);
    if(navigator.userAgent.match("Safari")) document.onmousewheel = externalScroll;
}

function externalScroll(event) {
    if( navigator.userAgent.match("MSIE")) { 
	    var delta = event.wheelDelta; 
	    var multiplier = (parseInt(delta) / 120) * 3;
	    event.returnValue = false; 
    }
    
    if( navigator.userAgent.match("Gecko")) { 
	    var delta = event.detail * -1; 
	    var multiplier = Math.round((parseInt(delta) / 3));
	    event.preventDefault(); 
    }
    
    if( navigator.userAgent.match("Safari")) { 
	    var delta = event.wheelDelta;
	    var multiplier = Math.round((parseInt(delta) / 12)/10); 
	    event.returnValue = false; 
    }
    $(document.flashId).onMouseWheel(multiplier);
}