iPhone GUI buttons problem

Hello everyone,

I've created 4 GUI textures that will serve as input. 3 arrows and jump button. There's a code attached to every texture:

 function Update () { 
 if(Input.touchCount > 0){
 
 for(var i : int = 0; i < Input.touchCount; i++)
         {
         var touch : Touch = Input.GetTouch(i);
             if(touch.phase == TouchPhase.Began && this.guiTexture.HitTest(touch.position)){
                 //do something
 
             }
 
         }
     } else {
         //do something other
 
     }

Now something about my problem. I can press them all at once, but when I release one button, it's still pressed. Any idea how to solve it?