solution http://stackoverflow.com/questions/7059039/prevent-accidental-select-drag-highlight http://stackoverflow.com/questions/5796512/how-to-disable-select-for-html5-canvas-element
solution
http://stackoverflow.com/questions/7059039/prevent-accidental-select-drag-highlight
http://stackoverflow.com/questions/5796512/how-to-disable-select-for-html5-canvas-element