The invention provides novel compounds having the general formula:wherein R1, R2 and R3 are as described herein, compositions including the compounds and methods of using the compounds. Additionally, visibility rights may be conditional, such that various events may modify visibility rights making a previously un-viewable page or document section viewable to a particular person. An additional belt tensioner includes an idler pulley having a bearing with a mounting hole and includes an arm having a post. When the batter executes a level swing, the target ball slides along the cord. The regions can have different shapes and sizes, and in some cases, the regions can follow a route. A touch sensitive detection method is also provided.