lexus4me40

Hello I have a big problem and need serious help. I was changing the timing belt on my 2004 Lexus ES330. I had the timing belt installed and noticed that on the harmonic balancer that teeth of the belt were not in the sprocket. I marked the sprockets and timing belts before I loosened the tensioner so I could be sure that they were all in proper spot. However, I wasn't paying attention and relieved the tensioner the front sprocket that goes to the cam moved out of place. I'm wondering what I can do to make sure that it is back because I do not want my engine to be out of sync. Please help!!!!!!!!!!!!!!!!!!!!!!!!!