Simple graph program

Hi there - I need a simple little graph script. An administrator enters in the following information: Test Score (140-180) GPA (2.5-4.0) Name Link Color With the information a colored point would be added to a graph that when hovered on, would show the 'Name' and when clicked would follow the link. Also, if possible, a user could enter in a test score and GPA and it would make a temporary circle on the graph in a light color.