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1 Drag this bookmarklet on to you bookmark-bar:

Find in Gmaps

2 select the town-name on the webpage end click this bookmarklet in the bar:
Prague [try it]
or coordinates in this form: 50.08804,14.42076 [try it]

3 if no selection is made, you are prompted for a town-name.

[tested in Google-chrome, will probably work in most browsers]