diff --git a/classes/ComicPress.inc b/classes/ComicPress.inc
index 30bddf6..20af209 100644
--- a/classes/ComicPress.inc
+++ b/classes/ComicPress.inc
@@ -237,8 +237,10 @@ class ComicPress {
 		if (isset($this->comicpress_options['image_types'])) {
 		  if (is_array($this->comicpress_options['image_types'])) {
 		  	foreach ($this->comicpress_options['image_types'] as $type => $properties) {
-		  		if ($properties['default'] === true) {
-		  			return $type;
+		  		if (isset($properties['default'])) {
+			  		if ($properties['default'] === true) {
+			  			return $type;
+			  		}
 		  		}
 		  	}
 		  }
diff --git a/classes/ComicPressBackend.inc b/classes/ComicPressBackend.inc
index 3e7658a..9adc790 100644
--- a/classes/ComicPressBackend.inc
+++ b/classes/ComicPressBackend.inc
@@ -2,6 +2,7 @@
 
 class ComicPressBackend {
 	function _embed_image($size) {
+		$size = $this->ensure_type($size);
 		$extras = array();
     $dims = $this->dims($size);
 		if (!empty($dims)) {
@@ -17,7 +18,7 @@ class ComicPressBackend {
 			unset($extras[$field]);
 		}
 
-		$output = sprintf('<img src="%s" alt="%s" title="%s" %s/>', $this->url(), $this->alt(), $this->title(), implode("", $extras));
+		$output = sprintf('<img src="%s" alt="%s" title="%s" %s/>', $this->url($size), $this->alt(), $this->title(), implode("", $extras));
 		return apply_filters('comicpress_embed_image', $output, $this);
 	}
 
@@ -31,4 +32,32 @@ class ComicPressBackend {
 		}
 		return false;
 	}
+
+	function ensure_type($type) {
+		if (is_null($type)) {
+			$comicpress = ComicPress::get_instance();
+			if (is_null($type)) {
+				$type = $comicpress->get_default_image_type();
+			}
+		}
+		return $type;
+	}
+
+	function embed($type = null) { return $this->_embed_image($this->ensure_type($type)); }
+
+
+	function get_info($size = null) {
+		$size = $this->ensure_type($size);
+
+		$info = array();
+		foreach (array('dims', 'url', 'file') as $field) {
+			$result = $this->{$field}($size);
+			if (is_array($result)) {
+				$info = array_merge($info, $result);
+			} else {
+				$info[$field] = $result;
+			}
+		}
+		return $info;
+	}
 }
diff --git a/classes/backends/ComicPressBackendAttachment.inc b/classes/backends/ComicPressBackendAttachment.inc
index 88c246e..3fe52db 100644
--- a/classes/backends/ComicPressBackendAttachment.inc
+++ b/classes/backends/ComicPressBackendAttachment.inc
@@ -12,17 +12,12 @@ class ComicPressBackendAttachment extends ComicPressBackend {
 		$this->type = get_post_meta($this->attachment->ID, 'comic_image_type', true);
 	}
 
-	function dims($size = 'comic') {
+	function dims($size = null) {
+		$size = $this->ensure_type($size);
 		$comicpress = ComicPress::get_instance();
 
 		$dims = array();
 		if (isset($comicpress->comicpress_options['image_types'])) {
-			if ($size == 'default') {
-				foreach ($comicpress->comicpress_options['image_types'] as $type => $info) {
-					if ($info['default']) { $size = $type; break; }
-				}
-			}
-
 			if (isset($comicpress->comicpress_options['image_types'][$size])) {
 				if (isset($comicpress->comicpress_options['image_types'][$size]['dimensions'])) {
 					$dims = array_combine(array('width', 'height'), explode("x", $comicpress->comicpress_options['image_types'][$size]['dimensions']));
@@ -44,24 +39,10 @@ class ComicPressBackendAttachment extends ComicPressBackend {
 	}
 
 	// @codeCoverageIgnoreStart
-	function embed($size = 'comic') { return $this->_embed_image($size); }
-	function file($size = 'comic') {	return $this->attachment->guid; }
+	function file($size = null) {	return $this->attachment->guid; }
 	function alt() { return $this->attachment->post_title; }
 	function title() { return $this->attachment->post_excerpt; }
 	// @codeCoverageIgnoreEnd
-
-	function get_info($size = 'comic') {
-		$info = array();
-		foreach (array('dims', 'url', 'file') as $field) {
-			$result = $this->{$field}($size);
-			if (is_array($result)) {
-				$info = array_merge($info, $result);
-			} else {
-				$info[$field] = $result;
-			}
-		}
-		return $info;
-	}
 }
 
 class ComicPressBackendAttachmentFactory {
diff --git a/classes/backends/ComicPressBackendURL.inc b/classes/backends/ComicPressBackendURL.inc
index de0679a..2e026ac 100644
--- a/classes/backends/ComicPressBackendURL.inc
+++ b/classes/backends/ComicPressBackendURL.inc
@@ -49,6 +49,8 @@ class ComicPressBackendURL extends ComicPressBackend {
 
 		return false;
 	}
+
+	function dims($size = null) { return false; }
 }
 
 class ComicPressBackendURLFactory {
diff --git a/classes/backends/partials/backend-url/_editor.inc b/classes/backends/partials/backend-url/_editor.inc
index dd5b74f..da39bbf 100644
--- a/classes/backends/partials/backend-url/_editor.inc
+++ b/classes/backends/partials/backend-url/_editor.inc
@@ -1,8 +1,8 @@
-<div class="comicpress-url-backend-holder">
+<div class="comicpress-backend-url-holder">
 	<table class="widefat">
 		<tr>
 			<td align="right" colspan="2">
-				<a class="comicpress-url-backend-deleter" href="#">X</a>
+				<a class="comicpress-backend-url-deleter" href="#">X</a>
 			</td>
 		</tr>
 		<?php
diff --git a/classes/backends/partials/backend-url/metabox.inc b/classes/backends/partials/backend-url/metabox.inc
index fbe5a6e..0ce9686 100644
--- a/classes/backends/partials/backend-url/metabox.inc
+++ b/classes/backends/partials/backend-url/metabox.inc
@@ -7,18 +7,38 @@
 </div>
 <a href="#" id="comicpress-backend-url-add-new">Add a new image</a>
 <script type="text/javascript">
-	$('comicpress-backend-url-add-new').observe('click', function(e) {
-		Event.stop(e);
-		new Ajax.Updater(
-			'comicpress-backend-url-holder-container',
-			ComicPressAdmin.ajax_uri, {
-				'insertion': 'bottom',
-				'parameters': {
-					'cp[_nonce]': ComicPressAdmin.nonce,
-					'cp[action]': 'backend-url-new-editor',
-					'cp[_action_nonce]': '<?php echo esc_js(wp_create_nonce('comicpress-backend-url-new-editor')) ?>'
+	(function() {
+		var set_up_deleters = function() {
+			$$('.comicpress-backend-url-holder').each(function(d) {
+				var deleter = d.select('.comicpress-backend-url-deleter').pop();
+				if (deleter) {
+					deleter.stopObserving();
+					deleter.observe('click', function(e) {
+						Event.stop(e);
+						if (confirm('Delete this image?')) {
+							d.remove();
+						}
+					});
 				}
-			}
-		);
-	});
+			});
+		};
+
+		$('comicpress-backend-url-add-new').observe('click', function(e) {
+			Event.stop(e);
+			new Ajax.Updater(
+				'comicpress-backend-url-holder-container',
+				ComicPressAdmin.ajax_uri, {
+					'insertion': 'bottom',
+					'parameters': {
+						'cp[_nonce]': ComicPressAdmin.nonce,
+						'cp[action]': 'backend-url-new-editor',
+						'cp[_action_nonce]': '<?php echo esc_js(wp_create_nonce('comicpress-backend-url-new-editor')) ?>'
+					},
+					onComplete: set_up_deleters
+				}
+			);
+		});
+
+		set_up_deleters();
+	}());
 </script>
diff --git a/test/ComicPressBackendTest.php b/test/ComicPressBackendTest.php
index fc504fc..7bf6296 100644
--- a/test/ComicPressBackendTest.php
+++ b/test/ComicPressBackendTest.php
@@ -36,7 +36,7 @@ class ComicPressBackendTest extends PHPUnit_Framework_TestCase {
     $backend = $this->getMock('ComicPressBackend', array('dims', 'url', 'alt', 'title'));
 
     $backend->expects($this->once())->method('dims')->with('comic')->will($this->returnValue($dims_result));
-    $backend->expects($this->once())->method('url')->will($this->returnValue('http://comic'));
+    $backend->expects($this->once())->method('url')->with('comic')->will($this->returnValue('http://comic'));
     $backend->expects($this->once())->method('alt')->will($this->returnValue('alt'));
     $backend->expects($this->once())->method('title')->will($this->returnValue('title'));
 
@@ -67,4 +67,51 @@ class ComicPressBackendTest extends PHPUnit_Framework_TestCase {
 
   	$this->assertEquals($expected_result, ComicPressBackend::generate_from_id($id));
   }
+
+  function providerTestEnsureType() {
+  	return array(
+  		array(null, 'comic'),
+  		array('comic', 'comic'),
+  		array('rss', 'rss')
+  	);
+  }
+
+  /**
+   * @dataProvider providerTestEnsureType
+   */
+	function testEnsureType($provided, $expected) {
+  	$comicpress = ComicPress::get_instance();
+  	$comicpress->comicpress_options = array(
+  		'image_types' => array(
+  			'comic' => array('default' => true),
+  			'rss' => array('default' => false)
+  		)
+  	);
+
+  	$this->assertEquals($expected, ComicPressBackend::ensure_type($provided));
+	}
+
+	function testGetEmbed() {
+		$ba = $this->getMock('ComicPressBackend', array('_embed_image', 'ensure_type'));
+		$ba->expects($this->once())->method('ensure_type')->with('test')->will($this->returnValue('ensured'));
+		$ba->expects($this->once())->method('_embed_image')->with('ensured')->will($this->returnValue('embed'));
+
+		$this->assertEquals('embed', $ba->embed('test'));
+	}
+
+
+  function testGetInfo() {
+  	$ba = $this->getMock('ComicPressBackend', array('dims', 'url', 'file'), array(), 'Mock_ComicPressBackend', false);
+
+  	$ba->expects($this->once())->method('dims')->will($this->returnValue(array('width' => 320, 'height' => 240)));
+  	$ba->expects($this->once())->method('url')->will($this->returnValue('http://blah/file.jpg'));
+  	$ba->expects($this->once())->method('file')->will($this->returnValue('/root/file.jpg'));
+
+  	$this->assertEquals(array(
+  		'width' => 320,
+  		'height' => 240,
+  		'url' => 'http://blah/file.jpg',
+  		'file' => '/root/file.jpg'
+  	), $ba->get_info());
+  }
 }
\ No newline at end of file
diff --git a/test/ComicPressTest.php b/test/ComicPressTest.php
index 3b7c8ff..c0a5e26 100644
--- a/test/ComicPressTest.php
+++ b/test/ComicPressTest.php
@@ -301,6 +301,13 @@ class ComicPressTest extends PHPUnit_Framework_TestCase {
   			),
   			'comic'
   		),
+  		array(
+  			array(
+  				'rss' => array(),
+  				'comic' => array('default' => true),
+  			),
+  			'comic'
+  		),
   	);
   }
 
diff --git a/test/backends/ComicPressBackendAttachmentTest.php b/test/backends/ComicPressBackendAttachmentTest.php
index 309da37..7f0a3ff 100644
--- a/test/backends/ComicPressBackendAttachmentTest.php
+++ b/test/backends/ComicPressBackendAttachmentTest.php
@@ -17,7 +17,7 @@ class ComicPressBackendAttachmentTest extends PHPUnit_Framework_TestCase {
       array('comic', true, array()),
       array('comic', array(), array()),
       array('comic', array('dimensions' => '300x200'), array('width' => 300, 'height' => 200)),
-      array('default', array('dimensions' => '300x200', 'default' => true), array('width' => 300, 'height' => 200))
+      array(null, array('default' => true, 'dimensions' => '300x200'), array('width' => 300, 'height' => 200)),
      );
   }
 
@@ -40,30 +40,16 @@ class ComicPressBackendAttachmentTest extends PHPUnit_Framework_TestCase {
       array(false, false),
       array(true, false),
       array(array(), false),
-      array(array('url', 300, 200, false), 'url')
-    );
+      array(array('url', 300, 200, false), 'url'),
+      array(array('url', 300, 200, false), 'url', null),
+     );
   }
 
   /**
    * @dataProvider providerTestUrl
    */
-  function testUrl($image_downsize_result, $expected_result) {
-    _set_image_downsize_result(1, 'comic', $image_downsize_result);
+  function testUrl($image_downsize_result, $expected_result, $which = 'comic') {
+  	_set_image_downsize_result(1, 'comic', $image_downsize_result);
     $this->assertEquals($expected_result, $this->ba->url('comic'));
   }
-
-  function testGetInfo() {
-  	$ba = $this->getMock('ComicPressBackendAttachment', array('dims', 'url', 'file'), array(), 'Mock_ComicPressBackendAttachment', false);
-
-  	$ba->expects($this->once())->method('dims')->will($this->returnValue(array('width' => 320, 'height' => 240)));
-  	$ba->expects($this->once())->method('url')->will($this->returnValue('http://blah/file.jpg'));
-  	$ba->expects($this->once())->method('file')->will($this->returnValue('/root/file.jpg'));
-
-  	$this->assertEquals(array(
-  		'width' => 320,
-  		'height' => 240,
-  		'url' => 'http://blah/file.jpg',
-  		'file' => '/root/file.jpg'
-  	), $ba->get_info());
-  }
 }