Geometry: Two column proof for this.

I need a two-column proof for this asap. (Statements & its corresponding reason)

Given: JKLM is a parallelogram
<M is a right angle (It is read as angle M)
MJ = JK (MJ is congruent to JK)
Prove: Parallelogram JKLM is a square

Illustration:
http://i45.tinypic.com/e1b6yp.png

Appreciated. ♥

1) JKLM is a rectangle --- if a parallelogram contains one right angle, then all other angles are right angles and its a rectangle.
2) JM = LK , LM = JK ---- Opposite sides of a parallelogram are congruents.
3) JM = JK = LM = LK ---- Transitive property
4) JKLM is a square ----- Defn of a square (4 right angles and all sides are congruent)