function getImgSrc(target, callback) {     if (window.FileReader) {         var oPreviewImg = null, oFReader = new window.FileReader();         oFReader.onload = function (oFREvent) {             oPreviewImg = new Image();             var type = target.files[0].type.split("/")[1];             var src = oFREvent.target.result;             oPreviewImg.src = src;             if (typeof callback == "function") {                 callback(oPreviewImg, target, type, src);             }             return oPreviewImg.src;         };         return (function () {             var aFiles = target.files;             if (aFiles.length === 0) {                 return;             }             if (!IsImgType(aFiles[0].type)) {                 alert("You must select a valid image file!");                 return;             }             if (aFiles[0].size > 1024 * 1024) {                 target.value = "";                 alert('Please upload image file size less than 1M.');                 return;             }             oFReader.readAsDataURL(aFiles[0]);         })();     }     if (navigator.appName === "Microsoft Internet Explorer") {         return (function () {             document.getElementById("imagePreview").filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = target.value;         })();     } }