Character Movement to mouseclick?

[vexxy]

I was wondering how I would setup a file to animate a movieclip to move to wherever the mouse was clicked, like a person walking to the clicked position BUT I want to be able to make it stop if it encounters a wall, and then not be able to move through that wall. I have basic experience in flash, and I know my way around, but I have no clue how I would go about doing this.
Thanks!

[MAGG0T]

1st Frame

movePlayer = function () {
this.dx = (this.targx-this._x)*.1;
this.dy = (this.targy-this._y)*.1;
this._x += this.dx;
this._y += this.dy;
};

setTarget = function () {
this.targx = _root._xmouse;
this.targy = _root._ymouse;

};
Player.targx = 10;
Player.targy = 10;
Player.onEnterFrame = movePlayer;
Player.onMouseDown = setTarget;

Create a MovieClip with the Instance name of Player
Done!

I made a quick example here : http://sound4-ls.webs.com/Player.swf