Adding add channel button image

admin/functions.php

@@ -57,7 +57,7 @@ function addEdit($type) {
 
 function jsonForAjax($arr) {
 	// Only return JSON for AJAX POSTs
-	if ($_POST['ajax']) {
+	if (isset($_POST['ajax'])) {
 		echo json_encode($arr);
 		die();
 	}

css/layout.css

@@ -485,6 +485,10 @@ input.add-channel {
     -webkit-transition: border 0.1s;
 }
 
+#add-channel-button .thumbnail {
+    background-image:url(../img/addChannel.jpg);
+}
+
 .channels .channel.loading {
     background: none;
 }