// Checks if a style name exists

var aStyleName : String = "A Style I have";

function OnGUI() {
if(GUI.skin.FindStyle(aStyleName) == null) {
Debug.LogWarning("No style named \"" + aStyleName + "\" could be found");
}
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public string aStyleName = "A Style I have";
void OnGUI() {
if (GUI.skin.FindStyle(aStyleName) == null)
Debug.LogWarning("No style named \"" + aStyleName + "\" could be found");

}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public aStyleName as string = 'A Style I have'

def OnGUI():
if GUI.skin.FindStyle(aStyleName) == null:
Debug.LogWarning((('No style named "' + aStyleName) + '" could be found'))