Web player screen resolution GUI placement

I made a game following the walker boys tutorial (here) The menu loads centered correctly if you run the game in the editor or as a standalone. However as you can see in the web player it goes to the bottom right.

Here's what I used to center the menus.

 // Main Menu script
 private var coordX:int = 300;
 private var coordY:int = 60;
 var the_text:String;
 function Start() {
  coordX = Screen.currentResolution.width/2 -60;
  coordY = Screen.currentResolution.height/2 - 120;
  the_text = "WELCOME TO CLICK";
 }
 function OnGUI () {
  GUI.Label(Rect(coordX+20, coordY, 400,400), the_text);
  if (GUI.Button(Rect(coordX,coordY+50,170,60), "Start Game")) {
  //print("Start Game");
  Application.LoadLevel("sceneLevel1"); // starts level 1
  }
  if (GUI.Button(Rect(coordX,coordY+120,170,60), "Exit Game")) {
  print("Exit Game");
  Application.Quit(); // ends the game
  }
 }