Hi Jay,
Basically you just use
Application.FollowHyperlink Me.XXX.Value
in the button's Click event Procedure, where XXX is the name of the
control displaying the field containing the URL.
If this is a hyperlink field containing hyperlinks (as against a text
field containing the URL) you may need to use the HyperlinkPart function
to extract the URL from the hyperlink field, something like
Application.FollowHyperlink HyperlinkPart(Me.XXX.Value, acFullAddress)