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How to turn on/off multiple lights using GUI buttons in C# with imagetargets

Hi there, 

 Does anybody knows how to create guibutton switch for multiple lights in C# with out destroying it when loading a new scene.  For example, I have 1 GUI button which could be the switch that can be a toggle for on/off the lights. If I have 5 point lights in the scene, and 1 gui button that can control at once. And I also found some issue when using imagetargets all the lights are destroyed after the scene was reloaded. And right now I'm using an ipad 3 for testing. Can anyone help me with my problem. Any thing will do,  I just want to use for my simple AR project. Javascript or C# would be fine. Thanks.