How can I dynamically changed where buttons are placed?

Hello, my buttons are using a custom style. I have been able to place them exactly where I want using code. However, when I changed the game window size the buttons of course were in the wrong spots and not scaled correctly. Is there any simple way to dynamically change the placement and scale of the buttons without using a bunch of if statements with different bounding rectangles for each? Thanks for any help.

Here’s what I use, scales the GUI depending on the size of the window

private var scale : Vector3;
var originalWidth = 854.0;  // define here the original resolution
var originalHeight = 480.0; // you used to create the GUI contents 

function OnGUI (){
    scale.x = Screen.width/originalWidth; // calculate hor scale
    scale.y = Screen.height/originalHeight; // calculate vert scale
    scale.z = 1;
    var svMat = GUI.matrix; // save current matrix
    GUI.matrix = Matrix4x4.TRS(Vector3(0,0,0), Quaternion.identity, scale); // substitute matrix - only scale is altered from standard 
    //code here
    GUI.matrix = svMat; // restore matrix

Okay thanks for the response. So here is my code as it stands. How would I adapt my code to work like yours. I understand your code I’m just having a hard time making mine look like yours.

using UnityEngine;
using System.Collections;

public class MainMenuGUI : MonoBehaviour {

	public GUIStyle PlayButton;
	public GUIStyle OptionsButton;
	public GUIStyle InstructionsButton;
	public GUIStyle ExitButton;
	public Texture Background;
	bool doWindow0 = false;
	// Use this for initialization
	void Start () {
	// Update is called once per frame
	void Update () {
		doWindow0 = false;
	void OnGUI () {
		//Draw Background
		GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),Background,ScaleMode.StretchToFill, false, 0.0f);
		//Draw PlayButton
		if (GUI.Button(new Rect(30,180,235,590),"",PlayButton))
		//Draw OptionsButton
		GUI.Button(new Rect(260,330,220,440),"",OptionsButton);
		//Draw InstructionsButton
		if (GUI.Button(new Rect(1160,330,145,440),"",InstructionsButton))
			doWindow0 = true;
		//Draw ExitButton
		if (GUI.Button(new Rect(1320,180,265,590),"",ExitButton))
		if (doWindow0 == true)
			GUI.Window (0, new Rect(Screen.width/2-240,Screen.height/2-100,800,120), DoMyWindow, "Instructions:");
	void DoMyWindow (int windowID) {
		GUI.Label (new Rect (10, 20, 800, 40), "Welcome to RedLightLife! Use WASD keys to move your character and use KL to rotate the camera. Use the J key to interact with people and objects. To have your character jump use the SPACEBAR. To pause your game, press the P key.");
		if (GUI.Button (new Rect (10,80,100,20), "Close"))
			doWindow0 = false;