rem: function Clear() 
add: function Clear() 
context: function Clear() {  var canvas = document.getElementById("canvas");  var ctx    = canvas.getContext("2d");  ctx.clearRect(0, 0, canvas_width, canvas_height);}
meta: 8858	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8858/374abd5173baac3ed0f6912dfd48568b3eef8365/move.js/buggy/pmd/scripts/move.js