Weird GUI problem

Hi. In my OnGUI funciton i am using a GUI.Button to move my character but i dont have to click on it and its mocing by himself... and also " Move " is written on the console every frame.I have been using this OnGUI function in other games and was working fine , i dont know what happend to unity but it is not working poperly.THANKS FOR THE HELP!

 #pragma strict
 
 public var skin : GUISkin;
 public var player1 : GameObject;
 
 function OnGUI()
 {
     GUI.skin = skin;
     
     if ( GUI.Button ( Rect ( 0 , 0 , 100 , 100 ) ,  " " ) ) ;
         {
             player1.rigidbody2D.velocity = Vector2 ( 0 , 10 );
             Debug.Log( " Move " ) ;
         }
     
 }