How do I make the scrollbars wider?

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http://askubuntu.com – I'm using Gnome 64-bit edition with the classic desktop and I don't have overlay scrollbars installed. My question is, how can I make the scrollbars wider? They're too thin for me to hit as quickly or accurately as I'd like. Is there a setting I can change in the theme files or d/gconf somewhere? Thanks for your help! (HowTos)