Rotation.... CCW?

Hi… simple question for most.

What do I do to make this rotate the line_mc move clip in a counterclockwise rotation when I scroll the mouse wheel up instead of down.

Currently it rotates the movie clip in a clockwise fashion regardless of which way I scrool the mouse wheel.

code

[COLOR=royalblue]//to use this code create an movie clip on the stage called line_mc[/COLOR]
[COLOR=royalblue][/COLOR]
[COLOR=royalblue]var mouseListener:Object = new Object();
mouseListener.onMouseWheel = function(delta) {
clip_mc._x += delta;[/COLOR]
[COLOR=royalblue]}
Mouse.addListener(mouseListener);[/COLOR]
[COLOR=royalblue]//The following example draws a line that rotates when you rotate the mouse wheel. Click the SWF file at runtime and then rotate your mouse wheel to see the movie clip in action.[/COLOR]
[COLOR=royalblue]line_mc.moveTo(0, 100);
line_mc.lineTo(0, 0);
line_mc._x = 200;
line_mc._y = 200;[/COLOR]
[COLOR=royalblue]var mouseListener:Object = new Object();
mouseListener.onMouseWheel = function(delta:Number) {
line_mc._rotation += 30;
}; [/COLOR]
[COLOR=royalblue]Mouse.addListener(mouseListener);[/COLOR]


Thanks in advance.

ps. is there anyway to get this thing to ease when it rotates… instead of the jerky rotation it does now.

Cheers.