Style used by default for the background part of GUI.HorizontalSlider controls.
The padding property is used to determine the size of the area the thumb can be dragged within.
// Modifies only the horizontal slider style of the current GUISkin
var hSliderValue : float = 0.0;
var style : GUIStyle;
function OnGUI () {
GUI.skin.horizontalSlider = style;
hSliderValue = GUILayout.HorizontalSlider (hSliderValue, 0.0, 10.0);
}