HayaiHaku

Ok so I think i almost got down actionscript as far as character movement,the problem is is that the script im using jerks the character around and doesnt even move in the right direction.Heres the code:

onClipEvent (load) {
movespeed = 10;
}
onClipEvent (enterFrame) {
if (Key.isDown(Key.RIGHT)) {
play();
_rotation = 90;
_x += movespeed;
}
if (Key.isDown(Key.LEFT)) {
play();
_rotation = 270;
_x -= movespeed;
}
if (Key.isDown(Key.UP)) {
play();
_rotation = 0;
_y -= movespeed;
}
if (Key.isDown(Key.DOWN)) {
play();
_rotation = 180;
_y += movespeed;
}
if (Key.isDown(Key.RIGHT) && Key.isDown(Key.UP)) {
_rotation = 45;
}
if (Key.isDown(Key.LEFT) && Key.isDown(Key.UP)) {
_rotation = 315;
}
if (Key.isDown(Key.RIGHT) && Key.isDown(Key.DOWN)) {
_rotation = 135;
}
if (Key.isDown(Key.LEFT) && Key.isDown(Key.DOWN)) {
_rotation = 225;
}
}

__________________