rotate camera on mobile

On mobile how do you rotate camera like on google earth I watched this video Unity 3D Tutorials - Create a Cool 3D Main Menu - YouTube . Which inspired me. but its opposite on mobile and too fast when i use the standard assests/Scripts/camera Scripts I also want to set limits on how far the camera can rotate and only left to right right to left not up and down or down and up here is the script its probably wrong
Dropbox - Error - Simplify your life

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its a good tutorial