Pause button Android

I am having problems with my pause button. I have the GUITexture and varibles set up properly. However, when I press the button on the phone or tablet, I have to hold it to pause the game. I would like to press the button to stop the game and then press it again to start the game.

Code (csharp):

1.  
2. var pauseButton : GUITexture;
3.  
4.  
5. function Update()
6. {
7.  
8. for(var touch : Touch in Input.touches)
9.  
10. if(touch.phase==TouchPhase.Began  guiTexture.HitTest(touch.position))
11.     {
12. //          if(GUI.Button(Rect(200,0,200,39),"Pause Button" ))
13.  
14.         doPauseToggle();
15.     }
16.  
17.     else if(touch.phase==TouchPhase.Ended  guiTexture.HitTest)
18.     {
19.         unPauseGame();
20.     }
21.  
22. //  GUI.matrix = Matrix4x4.TRS (Vector3.zero, Quaternion.identity, Vector3(Screen.width / 600.0, Screen.height / 450.0, 1));
23.  
24.     // Draw player blip (centerObject)
25. //  bX=centerObject.transform.position.x * mapScale;
26. //  bY=centerObject.transform.position.z * mapScale;   
27. //  GUI.DrawTexture(Rect(mapCenter.x - mapWidth/2,mapCenter.y-mapHeight/2,mapWidth,mapHeight),pauseButton);
28.    
29.     // Draw blips for Enemies
30. //  DrawBlipsForEnemies();
31.  
32.  
33.  
34. }
35.  
36.  
37. function doPauseToggle()
38. {
39.  
40. if(Time.timeScale > 0)
41. {
42.     pauseGame();
43.  
44. } else{
45.     unPauseGame();
46. }
47.  
48. }
49.  
50.  
51. function pauseGame()
52. {
53.  
54. Time.timeScale = 0;
55.  
56. }
57.  
58. function unPauseGame()
59. {
60.  
61. Time.timeScale = 1;
62.  
63.  
64. }
65.  
66.  
67.  
68.  
69.  
70.  
71.  
72.  

 

I don't know if it gonna works but you need do in your button something like this
var control:boolean;
if touchphase==touch.began:
if (control==true)
control=false;
PauseGame();
else
control=true;
unPause()