Dodano obsługę WebP oraz poprawiono formatowanie kodu w plikach PHP i JS

libraries/functions-front.js

@@ -0,0 +1,27 @@
+var user_agent 	= navigator.userAgent.toLowerCase();
+var click_event = user_agent.match(/(iphone|ipod|ipad)/)  ? "touchend" : "click";
+var windowsize = $(window).width();
+
+$( function()
+{
+  function hasWebP() {
+    var rv = $.Deferred(), img = new Image();
+    img.onload = function() { rv.resolve(); };
+    img.onerror = function() { rv.reject(); };
+    img.src = "/libraries/webp.webp";
+    return rv.promise();
+  }
+
+  hasWebP().then(function() {
+    }, function() {
+      $('body').addClass('nowebp');
+      $( 'img' ).each( function()
+      {
+        if ( $( this ).attr( 'src-nowebp' ) )
+        {
+          $( this ).attr( 'src', $( this ).attr( 'src-nowebp' ) );
+          $( this ).attr( 'data-src', $( this ).attr( 'src-nowebp' ) );
+        }
+      });
+  });
+});