function magnify(imgID, zoom) {
var img, glass, w, h, bw;
img = document.getElementById(imgID);
glass = document.createElement("DIV");
glass.setAttribute("class", "img-magnifier-glass");
img.parentElement.insertBefore(glass, img);
glass.style.backgroundImage = "url('" + img.src + "')";
glass.style.backgroundRepeat = "no-repeat";
glass.style.backgroundSize = (img.width * zoom) + "px " + (img.height * zoom) + "px";
bw = 3;
w = glass.offsetWidth / 2;
h = glass.offsetHeight / 2;
glass.addEventListener("mousemove", moveMagnifier);
img.addEventListener("mousemove", moveMagnifier);
glass.addEventListener("touchmove", moveMagnifier);
img.addEventListener("touchmove", moveMagnifier);
function moveMagnifier(e) {
var pos, x, y;
e.preventDefault();
pos = getCursorPos(e);
x = pos.x;
y = pos.y;