// Modifies only the vertical scrollbar
// down button of the current GUISkin

var hSbarValue : float;
var style : GUIStyle;

function OnGUI () {
GUI.skin.verticalScrollbarDownButton = style;
hSbarValue = GUILayout.VerticalScrollbar (hSbarValue, 1.0, 0.0, 10.0);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public float hSbarValue;
public GUIStyle style;
void OnGUI() {
GUI.skin.verticalScrollbarDownButton = style;
hSbarValue = GUILayout.VerticalScrollbar(hSbarValue, 1.0F, 0.0F, 10.0F);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public hSbarValue as single

public style as GUIStyle

def OnGUI():
GUI.skin.verticalScrollbarDownButton = style
hSbarValue = GUILayout.VerticalScrollbar(hSbarValue, 1.0F, 0.0F, 10.0F)