var maxFeatureNo = 4 var featureNo var myFeature = new Array() myFeature[0] = 'feature1' myFeature[1] = 'feature2' myFeature[2] = 'feature3' myFeature[3] = 'feature4' myFeature[4] = 'feature5' featureNo = Math.round(Math.random() * maxFeatureNo) document.write(myFeature[featureNo])