diff --git a/scripts/jquery.parallax-1.1.3.js b/scripts/jquery.parallax-1.1.3.js
index f3569dc..d42821e 100644
--- a/scripts/jquery.parallax-1.1.3.js
+++ b/scripts/jquery.parallax-1.1.3.js
@@ -19,7 +19,7 @@ http://www.gnu.org/licenses/gpl.html
 		windowHeight = $window.height();
 	});
 
-	$.fn.parallax = function(xpos, speedFactor, outerHeight) {
+	$.fn.parallax = function(xpos, speedFactor, alterHeightPosition, outerHeight) {
 		var $this = $(this);
 		var getHeight;
 		var firstTop;
@@ -59,7 +59,14 @@ http://www.gnu.org/licenses/gpl.html
 					return;
 				}
 
-				$this.css('backgroundPosition', xpos + " " + Math.round((firstTop - pos) * speedFactor) + "px");
+				if(typeof alternHeightPosition != 'undefined') {
+					calc = firstTop - pos + alternHeightPosition;
+				}
+				else {
+					calc = firstTop - pos;
+				}
+
+				$this.css('backgroundPosition', xpos + " " + Math.round((calc) * speedFactor) + "px");
 			});
 		}