Uncaught exception: TypeError: Cannot convert 'canvas' to object
Error thrown at line 68, column 4 in updateCoordinates(event) in http://awilum.webdevart.ru/games/arc...game_engine.js:
mouseX = event.clientX - canvas.offsetLeft;
called from line 1, column 0 in <anonymous function>(event):
updateCoordinates(event)