Can Somebody Help Me With My Error?

I Am New To Programming And Would like Some Help With This Error I Keep Getting, I Am Trying To Make A Button Show On My Title Screen And I Keep Getting The Error ‘Unexpected Symbol ‘Play Game’ Expecting Identifier’ Here Is The Line Of Code With Error On -

if (GUI.Button (new Rect( Screen.width * .5f, Screen.height * .5f, Screen.width * .5f, Screen.hieght *.1f). "Play Game"))

It should be a comma, not a period after the Rect():

if (GUI.Button (new Rect( Screen.width * .5f, Screen.height * .5f, Screen.width * .5f, Screen.hieght *.1f), "Play Game"))