Juvenile dermatomyositis (JDMS) is one of the most serious of the childhood rheumatic diseases. The theory behind this trial is that early introduction of etanercept or methotrexate will prove to be effective in the treatment of JDMS. Pretreatment muscle biopsies, we believe there will be abnormalities in the blood vessels that will be correlated with worse physical strength and daily functional ability. The long-term goal is to improve the treatment of this serious childhood onset rheumatic disease and to better understand the pathogenic mechanism for the development of the vasculopathy (disorder of blood vessels) of JDMS. Identification of the specific mechanism of the vasculopathy may allow for the rational introduction of biologic treatments focused on vascular growth.