// Modifies only the horizontal slider thumb style of the current GUISkin

var hSliderValue : float = 0.0;
var style : GUIStyle;

function OnGUI () {
    GUI.skin.horizontalSliderThumb = style;
    hSliderValue = GUILayout.HorizontalSlider (hSliderValue, 0.0, 10.0);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float hSliderValue = 0.0F;
    public GUIStyle style;
    void OnGUI() {
        GUI.skin.horizontalSliderThumb = style;
        hSliderValue = GUILayout.HorizontalSlider(hSliderValue, 0.0F, 10.0F);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public hSliderValue as single = 0.0F

    public style as GUIStyle

    def OnGUI():
        GUI.skin.horizontalSliderThumb = style
        hSliderValue = GUILayout.HorizontalSlider(hSliderValue, 0.0F, 10.0F)