To go from DNA to Protein:
http://bioinformatics.picr.man.ac.uk...converter.html
To go from Protein to DNA:
http://www.gregthatcher.com/Bioinfor...Translate.aspx
Small note: For those not familiar with the genomic "alphabet", the letter M pulls double duty. If it is found at the beginning of a sequence it means "Begin". If it is found within a sequence it is simply M