Opening gallery and select and set image to an image widget

function gallerImages(){
  var querycontext = {mimetype:"image/*"};
  var Status = kony.phone.openMediaGallery(onselectioncallback, querycontext);

  function onselectioncallback(rawbytes)
  {
    frmProfile.flxCameraGallery.setVisibility(false);
    if(rawbytes !== null){
      base64Str = kony.convertToBase64(rawbytes);
      frmProfile.imgProfile.base64=base64Str;
      frmDashBoard.imgMenuProfile.base64 = base64Str;
    }else{
             alert("Please select image");
    }
  }
}