On button hover, Gui Box shows, on box hover, Gui Box shows

Hello so i was gonna design my menu for my game and wanted so if someone have their mouse over a button its shows a gui box with 3 or 4 buttons in it but i cant figure how i can doe so if people move the mouse to the gui box than it doesent dissapear here is my code:

	public bool boolMouseOver = false;

	GUI.Button(new Rect(Screen.width / 2 - 380, Screen.height / 2 - 130, 200, 50), new GUIContent("MENU", "Mouse Over Button"), style);
        if (GUI.tooltip == "Mouse Over Button")
            boolMouseOver = true;
        else
            boolMouseOver = false;

        if (boolMouseOver == true)
	{
        	GUI.Box(new Rect(Screen.width / 2 - 180, Screen.height / 2 - 130, 220, 300), new GUIContent("", "Mouse Over Button"));
        	if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 125, 180, 40), "1", style))
        	{
                	audio.PlayOneShot(buttonsound);
        	}
        	if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 75, 180, 40), "2", style))
        	{
        	        audio.PlayOneShot(buttonsound);
        	}
        	if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 25, 180, 40), "3", style))
        	{
        		audio.PlayOneShot(buttonsound);
		}
	}

Try this code

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour 
{


	public bool boolMouseOver ;

	public GUISkin MyGUISkin;



	void OnGUI()
	{		
		if(boolMouseOver == true )
		{
			GUI.Box(new Rect(Screen.width / 2 - 190, Screen.height / 2 - 140, 240, 320), new GUIContent("", "Mouse Exit Button") ,MyGUISkin.customStyles[0] );// Exit GUI Box ,MyGUISkin.customStyles[0] must be transparent png or nothing
			GUI.Box(new Rect(Screen.width / 2 - 180, Screen.height / 2 - 130, 220, 300), new GUIContent("", "Mouse Over Box")  ,MyGUISkin.customStyles[1]);// Original box
			if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 125, 180, 40), "1"  ))
			{
		    
		    }
		    if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 75, 180, 40), "2"  ))
		    {
		    
		    }
		    if (GUI.Button(new Rect(Screen.width / 2 - 160, Screen.height / 2 - 25, 180, 40), "3" ))
		    {
		    
		    }
	
		}
	
 		GUI.Box(new Rect(Screen.width / 2 - 390, Screen.height / 2 - 140, 210, 70), new GUIContent("", "Mouse Exit Button") ,MyGUISkin.customStyles[0] );// Mouse Exit BoxMyGUISkin.customStyles[0] must be transparent png or nothing
	    GUI.Button(new Rect(Screen.width / 2 - 380, Screen.height / 2 - 130, 200, 50), new GUIContent("MENU", "Mouse Over Button"),MyGUISkin.customStyles[1]  );// Menu Button
	   	
		
	
		if (GUI.tooltip == "Mouse Over Button")
		{
	   	boolMouseOver = true;
		}
		
		if(GUI.tooltip == "Mouse Exit Button")
		{
			boolMouseOver = false;
		}
		
		
	}	
}