Installing an internal Wireless Card in a 5150

Hello,  Can anyone tell me how to go about installing an internal wireless card into a 5150?  I had one in the PCI slot but it hit the side of the desk and the card broke.  Thanks to my son.  Anyway, I purchased a new Linksys wireless for the slot but it doesn't want to work unless I really push it in and hold it into the PCMCIA slot.  Once I let go the card won't stay engaged into the slot. 

 

I am new to working on Laptops.  I have unscrewed everything but something in the middle of the laptop seems to be still connected and I don't want to pull too hard as I don't know how it is attached.  It seems to be right under where the Memory cards are located.

 

I want to either install an internal wireless card and check to see if I need a new PCMCIA slot.

 

Any suggestions would be apprieciated!!

 

Thanks,

 

Todd.