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Using a power adapter other than one specifically designed for your laptop is a very bad idea. More voltage will likely fry the internals; less can cause damage from undervolting. In addition, many laptops are designed to work with laptops with very specific specs.
Chances are, you'll need to get a somewhat nicer power adapter. Although RadioShack's iGo multifunction adapter might work; I'd reccomend looking on E-bay for the real deal.