installing 1.1.3 from a jailbroken 1.1.1?

[supgraffix]

I have a jailbroken (but not unlocked) iphone using at&t service running 1.1.1 of the firmware. If I want to upgrade to 1.1.3 without bricking my iphone, can I simply just do a restore in itunes and then upgrade, or do I need to take other actions like virginizing the phone? If I restore my phone, will I lose all my content like music, e-mail connections, etc? Thanks in advance.
-Robert

 

[ajl917]

Just sync, to backup your data, restore, and then upgrade...

 

[supgraffix]

So once I 'sync' my iphone through itunes it will backup all of my data? If this is the case, where is this data located (I run win xp)? Also, once I restore my iphone to get rid of the jailbreak and upgrade to 1.1.3, how do I get the backed up data back on my iphone, or will the data not be deleted during the restore?
Thanks,
Robert