Attach a GUI Skin Dynamicaly

How can I attach a GUI Skin with Code. I only call my code during game play so I cant attach the skin in the inspector.

Thanks

Use Resources.Load.

var GUISkin mySkin;

function Start()
{
    mySkin = Resources.Load("MySkin");
}

function OnGUI()
{
    GUI.skin = mySkin;
    // Rest of gui code.
}

Here you are ;)