diff --git a/class.plugin-option.php b/class.plugin-option.php
index 324f5a4..2c53a35 100644
--- a/class.plugin-option.php
+++ b/class.plugin-option.php
@@ -36,7 +36,7 @@ function __construct ($details = array()) {
 		}
 
 		$option_filter = array(
-			'default' 	=> 	FILTER_SANITIZE_STRING,
+			'default' 	=> 	null,
 			'type' 		=> 	FILTER_SANITIZE_STRING,
 			'options' 	=> 	array(
 				'filter'	=> FILTER_SANITIZE_STRING,
diff --git a/class.plugin-settings.php b/class.plugin-settings.php
index 2990e3c..1116bc4 100644
--- a/class.plugin-settings.php
+++ b/class.plugin-settings.php
@@ -119,7 +119,7 @@ class Leaflet_Map_Plugin_Settings {
         'css_url' => array(
             'default'=>'https://unpkg.com/leaflet@%s/dist/leaflet.css',
             'type' => 'text',
-            'helptext' => 'Save as above.'
+            'helptext' => 'Same as above.'
         ),
         'default_attribution' => array(
             'default' => "<a href=\"http://leafletjs.com\" title=\"A JS library for interactive maps\">Leaflet</a>; \r\n© <a href=\"http://www.openstreetmap.org/copyright\">OpenStreetMap</a> contributors",
diff --git a/shortcodes/class.image-shortcode.php b/shortcodes/class.image-shortcode.php
index 2ba6148..d0f2485 100644
--- a/shortcodes/class.image-shortcode.php
+++ b/shortcodes/class.image-shortcode.php
@@ -36,29 +36,50 @@ class="leaflet-map"
         <script>
         WPLeafletMapPlugin.add(function () {
             var map,
+                options = L.Util.extend({}, {
+                    maxZoom: <?php echo $max_zoom; ?>,
+                    minZoom: <?php echo $min_zoom; ?>,
+                    zoomControl: <?php echo $zoomcontrol; ?>,
+                    scrollWheelZoom: <?php echo $scrollwheel; ?>,
+                    doubleClickZoom: <?php echo $doubleclickzoom; ?>,
+                    attributionControl: false
+                }, <?php echo $more_options; ?>, {
+                    crs: L.CRS.Simple
+                }),
                 image_src = '<?php echo $source; ?>',
                 img = new Image(),
                 zoom = <?php echo $zoom; ?>;
             img.onload = function() {
-                var h = img.height;
-                var w = img.width;
-                var southWest = map.unproject([-h, h], zoom);
-                var northEast = map.unproject([w, -w], zoom);
-                var bounds = new L.LatLngBounds(southWest, northEast);
+                var h = img.height,
+                    w = img.width,
+                    projected_zoom = zoom + 1,
+                    southWest = map.unproject([-w, h], projected_zoom),
+                    northEast = map.unproject([w, -h], projected_zoom),
+                    bounds = new L.LatLngBounds(southWest, northEast);
                 L.imageOverlay( image_src, bounds ).addTo( map );
                 map.setMaxBounds(bounds);
-                img.is_loaded = true;
             };
             img.src = image_src;
-            map = L.map('leaflet-map-image-<?php echo $this->map_id; ?>', {
-                maxZoom: <?php echo $max_zoom; ?>,
-                minZoom: <?php echo $min_zoom; ?>,
-                crs: L.CRS.Simple,
-                zoomControl: <?php echo $zoomcontrol; ?>,
-                scrollWheelZoom: <?php echo $scrollwheel; ?>
-            }).setView([0, 0], zoom);
+            map = L.map('leaflet-map-image-<?php echo $this->map_id; ?>', options).setView([0, 0], zoom);
             // make it known that it is an image map
             map.is_image_map = true;
+            if (<?php echo $fit_markers; ?>) {
+                map.fit_markers = true;
+            }
+            <?php
+            if ($attribution) {
+                /* add any attributions, semi-colon-separated */
+                $attributions = explode(';', $attribution);
+                ?>
+                var attControl = L.control.attribution({prefix:false}).addTo(map);
+                <?php
+                foreach ($attributions as $a) {
+                    ?>
+                    attControl.addAttribution('<?php echo trim($a); ?>');
+                    <?php
+                }
+            }
+            ?>
             WPLeafletMapPlugin.maps.push( map );
             WPLeafletMapPlugin.images.push( img );
         }); // end add
diff --git a/shortcodes/class.map-shortcode.php b/shortcodes/class.map-shortcode.php
index 7c86683..05007e7 100644
--- a/shortcodes/class.map-shortcode.php
+++ b/shortcodes/class.map-shortcode.php
@@ -29,25 +29,41 @@ protected function incrementMap () {
 		$this->map_id = $this->LM->map_count;
 	}
 
-	protected function getAtts ($atts, $content = null) {
-		if ($atts) extract($atts);
+	/**
+	* Merge shortcode options with default options
+	*
+	* @param array|string $atts key value pairs from shortcode 
+	* @param string $content 	inner text in shortcode
+	* @return array 			new atts, which is actually an array
+	*/
+
+	protected function getAtts ($atts = '', $content = null) {
+		$atts = (array) $atts;
+		extract($atts);
 
 		$settings = Leaflet_Map_Plugin_Settings::init();
 
-		$atts['zoom'] = empty($zoom) ? $settings->get('default_zoom') : $zoom;
+		$atts['zoom'] = array_key_exists('zoom', $atts) ? $zoom : $settings->get('default_zoom');
 		$atts['height'] = empty($height) ? $settings->get('default_height') : $height;
 		$atts['width'] = empty($width) ? $settings->get('default_width') : $width;
-		$atts['zoomcontrol'] = empty($zoomcontrol) ? $settings->get('show_zoom_controls') : $zoomcontrol;
-		$atts['min_zoom'] = empty($min_zoom) ? $settings->get('default_min_zoom') : $min_zoom;
+		$atts['zoomcontrol'] = array_key_exists('zoomcontrol', $atts) ? $zoomcontrol : $settings->get('show_zoom_controls');
+		$atts['min_zoom'] = array_key_exists('min_zoom', $atts) ? $min_zoom : $settings->get('default_min_zoom');
 		$atts['max_zoom'] = empty($max_zoom) ? $settings->get('default_max_zoom') : $max_zoom;
-		$atts['scrollwheel'] = empty($scrollwheel) ? $settings->get('scroll_wheel_zoom') : $scrollwheel;
-		$atts['doubleclickzoom'] = empty($doubleclickzoom) ? $settings->get('double_click_zoom') : $doubleclickzoom;
-		$atts['fit_markers'] = empty($fit_markers) ? $settings->get('fit_markers') : $fit_markers;
+		$atts['scrollwheel'] = array_key_exists('scrollwheel', $atts) ? $scrollwheel : $settings->get('scroll_wheel_zoom');
+		$atts['doubleclickzoom'] = array_key_exists('doubleclickzoom', $atts) ? $doubleclickzoom : $settings->get('double_click_zoom');
+		$atts['fit_markers'] = array_key_exists('fit_markers', $atts) ? $fit_markers : $settings->get('fit_markers');
 
 		/* allow percent, but add px for ints */
 		$atts['height'] .= is_numeric($atts['height']) ? 'px' : '';
 		$atts['width'] .= is_numeric($atts['width']) ? 'px' : '';   
 
+		/* 
+		need to allow 0 or empty for removal of attribution 
+		*/
+		if (!array_key_exists('attribution', $atts)) {
+		    $atts['attribution'] = $settings->get('default_attribution');
+		}
+
 		/* allow a bunch of other options */
 		// http://leafletjs.com/reference-1.0.3.html#map-closepopuponclick
 		$more_options = array(
@@ -107,14 +123,6 @@ protected function getHTML ($atts, $content = null) {
 		$lat = empty($lat) ? $settings->get('default_lat') : $lat;
 		$lng = empty($lng) ? $settings->get('default_lng') : $lng;
 
-		/* 
-		need to allow 0 or empty for removal of attribution 
-		*/
-		if (!$atts ||
-		    !array_key_exists('attribution', (array) $atts)) {
-		    $attribution = $settings->get('default_attribution');
-		}
-
 		/*
 		mapquest doesn't need tile urls
 		*/
diff --git a/templates/shortcode-helper.php b/templates/shortcode-helper.php
index b4e43c3..4c653c0 100644
--- a/templates/shortcode-helper.php
+++ b/templates/shortcode-helper.php
@@ -79,7 +79,7 @@
 					'[leaflet-geojson src=https://cdn.rawgit.com/bozdoz/064a7101b95a324e8852fe9381ab9a18/raw/03f4f54b13a3a7e256732760a8b679818d9d36fc/map.geojson fitbounds=1 popup_property="popup-text"]'
 					),
 				"Test Image Map" => array(
-					'[leaflet-image min_zoom=-2 max_zoom=15 zoom=1 zoomcontrol=1 scrollwheelzoom=1]',
+					'[leaflet-image zoom=1 zoomcontrol=1 scrollwheelzoom=1 attribution=0]',
 					'[leaflet-marker]'
 					)
 				);