The purpose of this 12-week active controlled trial is to evaluate the safety and efficacy of valsartan 80/160/320 mg (weight stratified) compared with enalapril 10/20/40 mg (weight stratified) on sitting systolic blood pressure (SSBP) in 6 - 17 year old children with hypertension (SSBP ≥ 95th percentile for age gender and height).