diff --git a/parallax.js b/parallax.js
index 2d8b64b..437b71a 100644
--- a/parallax.js
+++ b/parallax.js
@@ -1,3 +1,23 @@
+var Parallax = {
+    initialise: function() {
+
+    },
+    calculate: function() {
+
+    },
+    events: function() {
+
+    },
+}
+
+function is_on_screen(elm) {
+
+    var vpH = $(window).height(), // Viewport Height
+        st = $(window).scrollTop(), // Scroll Top
+        y = $(elm).offset().top,
+        elementHeight = $(elm).height();
+    return ((y < (vpH + st)) && (y > (st - elementHeight)));
+}
 function init_parallax() {
     $('.parallax').each(function(){
         // Calculate Offset