Style used by default for the left button on GUI.HorizontalScrollbar controls.

	// Modifies only the horizontal scrollbar 
	// left button of the current GUISkin
	var hSbarValue : float;
	var style : GUIStyle;
	function OnGUI () {
		GUI.skin.horizontalScrollbarLeftButton = style;
		hSbarValue = GUILayout.HorizontalScrollbar (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.horizontalScrollbarLeftButton = style;
        hSbarValue = GUILayout.HorizontalScrollbar(hSbarValue, 1.0F, 0.0F, 10.0F);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public hSbarValue as float

	public style as GUIStyle

	def OnGUI() as void:
		GUI.skin.horizontalScrollbarLeftButton = style
		hSbarValue = GUILayout.HorizontalScrollbar(hSbarValue, 1.0F, 0.0F, 10.0F)