Changing color using Actions question

I am trying to make a visual timer with a colored elipse object. Initially, I want the object black. The triggering/iniatiating event is a mouse click on the page. After 30 seconds I want to modify the elipse object color to be green. After 30 more seconds I want to modify the elipse object color to be yellow. After 30 more seconds I want the elipse object color to be red. Finally, after 30 more seconds I want the elipse object color to be blue.Is it possible to use Actions to modify objects properties? If so, how?John

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