function detectDevice() { 
 if( navigator.userAgent.match(/Android/i)
 || navigator.userAgent.match(/webOS/i)
 || navigator.userAgent.match(/iPhone/i)
 || navigator.userAgent.match(/iPad/i)
 || navigator.userAgent.match(/iPod/i)
 || navigator.userAgent.match(/BlackBerry/i)
 || navigator.userAgent.match(/Windows Phone/i)
 ){

  }
 else {
    imageZoomOnScrool();
  }
}
detectDevice()

function imageZoomOnScrool() {
	$(document).ready(function() {

		var native_width = 0;
		var native_height = 0;
		$(".large").css("background", "url('" + $(".small").attr("src") + "') no-repeat");

		//Now the mousemove function
		$(".magnify").mousemove(function(e) {
			//When the user hovers on the image, the script will first calculate
			//the native dimensions if they don't exist. Only after the native dimensions
			//are available, the script will show the zoomed version.
			if (!native_width && !native_height) {
				//This will create a new image object with the same image as that in .small
				//We cannot directly get the dimensions from .small because of the 
				//width specified to 200px in the html. To get the actual dimensions we have
				//created this image object.
				var image_object = new Image();
				image_object.src = $(".small").attr("src");

				//This code is wrapped in the .load function which is important.
				//width and height of the object would return 0 if accessed before 
				//the image gets loaded.
				native_width = image_object.width;
				native_height = image_object.height;
			} else {
				//x/y coordinates of the mouse
				//This is the position of .magnify with respect to the document.
				var magnify_offset = $(this).offset();
				//We will deduct the positions of .magnify from the mouse positions with
				//respect to the document to get the mouse positions with respect to the 
				//container(.magnify)
				var mx = e.pageX - magnify_offset.left;
				var my = e.pageY - magnify_offset.top;

				//Finally the code to fade out the glass if the mouse is outside the container
				if (mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0) {
					$(".large").fadeIn(1000);
				} else {
					$(".large").fadeOut(100);
				}
				if ($(".large").is(":visible")) {
					//The background position of .large will be changed according to the position
					//of the mouse over the .small image. So we will get the ratio of the pixel
					//under the mouse pointer with respect to the image and use that to position the 
					//large image inside the magnifying glass
					var rx = Math.round(mx / $(".small").width() * native_width - $(".large").width() / 2) * -1;
					var ry = Math.round(my / $(".small").height() * native_height - $(".large").height() / 2) * -1;
					var bgp = rx + "px " + ry + "px";

					//Time to move the magnifying glass with the mouse
					var px = mx - $(".large").width() / 2;
					var py = my - $(".large").height() / 2;
					//Now the glass moves with the mouse
					//The logic is to deduct half of the glass's width and height from the 
					//mouse coordinates to place it with its center at the mouse coordinates

					//If you hover on the image now, you should see the magnifying glass in action
					$(".large").css({
						left: px,
						top: py,
						backgroundPosition: bgp
					});
				}
			}
		})
	})
}