Mouse movement and collision

Here's the problem I'm having:

I have the mouse moving my paddle back and forth on the screen. But when the paddle hits its world limits it bounces between the mouse position and its limit point. The only way I could fix this is to have the mouse check its X position and fix it if it was outside the world limits of the paddle.

function sceneWindow2D::mouseMovePaddle(%this, %mod, %worldPosition)
{
%movement = %this.getMousePosition();
%mouseX = getWord(%movement, 0);

//clamp to boundries
if(%mouseX < -40)
%mouseX = -40;
if(%mouseX > 40)
%mouseX = 40;

$pPaddle.setPositionX(%mouseX);

%this.setMousePosition($pPaddle.getPosition());

Canvas.hideCursor();
$lastMousePos = $pPaddle.getPosition();
}

I tried to use $pPaddle.minX = getWord($pPaddle.getWorldLimit(), 1) instead of the -40, but I didn't work. It was only when I hard coded the limit that it worked.

Any ideas would be great. I want to make levels with out having to hard code all the boundries...