If you can post a cpu-z screenshot that would help.
Also, look here for a list of processors: http://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors#Mobile_processors
You want to match the socket as well as the rated TDP, at least. Another good thing to look at is what processors are available with other configurations of your laptop. You should also double check that your RAM and such are compatible with teh new one as well, or get RAM that is. That shouldn't be an issue though. Also back up your hard drive in case something happens.
However, even if theory you get a processor that should be totally compatible, you may not be able to use it due to BIOS whitelisting. A lot of manufacturers do it on notebooks and consumer oriented machines, and it's quite possible the BIOS will stop the machine if you put in a different processor. Usually, if you get a processor that can be found in other configurations of the machine, the BIOS will support it. All of this stuff is hit or miss though.
Finally if and when you get your processor, or if you remove your current one for any other reason, you'll have to clean off the die and the heatsink and reapply thermal compound. You might be able to get away without reapplying if you put the same on back in, but it isn't recommended, especially on mobile systems that tend to heat up quickly. I use Arctic Cooling MX-4 paste, but there are lots of others. Here's an article on pastes: http://www.overclock.net/t/1202552/maximum-pc-geek-tested-17-thermal-pastes-face-off
There are a couple that perform better then the MX-4, but I like it because there's no cure time, its nonconductive, won't damage the processor/heatsink, and it's easier to spread than a lot of others. I use it in my laptop as well as my desktop machines.