Skype is not in my phone
 

I have flashed my Nokia N900 with RX-51_2009SE_20.2010.36-2.004_PR_COMBINED_004_ARM.bin. Now phone is working perfectly but Skype is not showing anywhere in my phone. I searched in Settings>IM & VOIP accounts but it is not there. Previsouly it was working perfectly. But due to some problems in Application Manager I had to flash it. can anybody help me out? how can I get back it?

Plz Plz...Thanks