I have a 2503 router in which the ios is corrupted, so can I restore ios directly from another router?

I suspect you might be in a hurry, so see Restore the Cisco IOS to a router (http://articles.techrepublic.com.com/5100-10878_11-5623025.html) for a general summary of IOS recovery. I don't know how well the procedure applies to a 2503, so check Cisco's website for 2503 specifics.