JavaScript GUI development, just basics needed

I can only write simple JaveScripts like printing a table or computing some staff from a formula.
I would like to be able to develop gui applications that involve shapes/object that you
can point/drag/click, in a division of a web page. Are there free frameworks that let do GUI in JavaScripts? I want an application like you can click a point within a triangle and then it draw lines from the point to the three corners. Can JavaScript produce such applications or I have to use something else?

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zzhang2006ProfessorAuthor Commented:
You're welcome...
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