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var ev = event || window.event; var mousePos = mousePosition(ev); function mousePosition(ev) { if (ev.pageX || ev.pageY) { return {x: ev.pageX, y: ev.pageY}; } return { x: ev.clientX + document.body.scrollLeft - document.body.clientLeft, y: ev.clientY + document.body.scrollTop - document.body.clientTop }; }