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function magnify(imgID, zoom) {   var img, glass, w, h, bw;   img = document.getElementById(imgID);   /* Create magnifier glass: */   glass = document.createElement("DIV");   glass.setAttribute("class", "img-magnifier-glass");   /* Insert magnifier glass: */   img.parentElement.insertBefore(glass, img);   /* Set background properties for the magnifier glass: */   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;   /* Execute a function when someone moves the magnifier glass over the image: */   glass.addEventListener("mousemove", moveMagnifier);   img.addEventListener("mousemove", moveMagnifier);   /*and also for touch screens:*/   glass.addEventListener("touchmove", moveMagnifier);   img.addEventListener("touchmove", moveMagnifier);   function moveMagnifier(e) {     var pos, x, y;     /* Prevent any other actions that may occur when moving over the image */     e.preventDefault();     /* Get the cursor's x and y positions: */     pos = getCursorPos(e);     x = pos.x;     y = pos.y;     /* Prevent the magnifier glass from being positioned outside the image: */     if (x > img.width - (w / zoom)) {x = img.width - (w / zoom);}     if (x < w / zoom) {x = w / zoom;}     if (y > img.height - (h / zoom)) {y = img.height - (h / zoom);}     if (y < h / zoom) {y = h / zoom;}     /* Set the position of the magnifier glass: */     glass.style.left = (x - w) + "px";     glass.style.top = (y - h) + "px";     /* Display what the magnifier glass "sees": */     glass.style.backgroundPosition = "-" + ((x * zoom) - w + bw) + "px -" + ((y * zoom) - h + bw) + "px";   }   function getCursorPos(e) {     var a, x = 0, y = 0;     e = e || window.event;     /* Get the x and y positions of the image: */     a = img.getBoundingClientRect();     /* Calculate the cursor's x and y coordinates, relative to the image: */     x = e.pageX - a.left;     y = e.pageY - a.top;     /* Consider any page scrolling: */     x = x - window.pageXOffset;     y = y - window.pageYOffset;     return {x : x, y : y};   } }