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i wouldn't advice you to do that, save yourself of that stress of combining there adapters together the current won't be enough. what you will do is to look for a 3 - 4 amps transformer and build a perfect dc power suply for your laptop, afterall the constructed power suply will last longer if not forever.
They probably won't be happy. They are unregulated and put out a lot more than 12V when unloaded. You would be strapping together dissimilar voltages and the high ones would be stuffing current into the lower ones.
An unregulated wall brick is just a transformer plus rectifier; imagine several of the following circuits with the +/- outputs connected in parallel: they won't be damaged even if they output slightly different voltages because the diodes will prevent damage to the transformer.
However if it's a regulated supply, then it probably isn't a good idea.
The laptop probably needs a regulated supply any way.
i was afraid to try it, for the sake of the laptop and of fire hazzard,, i found the power adapter on ebay for a mezely 5 bucks, 15 with shipping,, thanks guys. i think i am just going to buy a new one and wait a week or two..