problem offset with scroll

[keulu]

You have an issue when you scroll on your page, you don't calculte the value of the Main window scroll.

you can fix it by applying this path

in function getMouse()

add scrollOffset :

var top = window.pageYOffset || document.documentElement.scrollTop, left = window.pageXOffset || document.documentElement.scrollLeft;

and calculate the good position

mx = (e.pageX || e.touches[0].clientX) - offsetX + left;
my = (e.pageY || e.touches[0].clientY) - offsetY + top;