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"Scroll bar like" mechanism

	I am interested in creating a pop-up window for setting
probabilities or beliefs in an inference system. Ideally I would like a
"scroll bar like" mechanism which could be set by the mouse. Exiting such
a window could return an alist of symbols and corresponding integers
between 0 and 1.
	Has anyone created a package of tools along this line? Thanks in
		- Frank