move a gui element

hi everybody, I’m trying to move vertically a simple gui button, but I can’t figure it out. I’m not a programmer and my gui is very simple, I’ve tried to move a cube through animation and itween and it works, but how i can move the button? here’s my code

var controlTexture : Texture;
var customSkin : GUISkin;

function OnGUI () {
	GUI.Label (Rect (Screen.width/2-250, Screen.height/2-65, 500, 150), controlTexture);
	GUI.Box (Rect (0,0,150,100), "Top-left");
	GUI.Box (Rect (Screen.width - 150,0,150,100), "Top-right");
	GUI.Box (Rect (0,Screen.height - 100,150,100), "Bottom-left");
	GUI.Box (Rect (Screen.width - 150,Screen.height - 100,150,100), "Bottom-right");
	if (GUI.Button (Rect (Screen.width/2-250, Screen.height/2 - 170, 500, 100), "collocazione A")) {
		isLoading = true;
    	Application.LoadLevel("level1"); // load the game level.
		print ("you clicked collocazione A");
	if (GUI.Button (Rect (Screen.width/2-250, Screen.height/2 + 70, 500, 100), "collocazione B")) {
		print ("you clicked collocazione B");

and another question: I used Application.LoadLevel to load a level with another gui, how can I simply load a new window or label when I click the button?

thank you!

private bool showButton = true;
void OnGUI()
if (showButton)
if (GUI.Button(new Rect(100,100, 120, 25), “Sample button…”))
showButton = false;

Maybe this is what you are looking for? The only problem is that whenever you want your button back, you will need to find a suitable place to set showButton variable to true again.