diff --git a/htdocs/core/js/lib_head.js b/htdocs/core/js/lib_head.js
index dfe656a745e..ae6182177d7 100644
--- a/htdocs/core/js/lib_head.js
+++ b/htdocs/core/js/lib_head.js
@@ -214,7 +214,7 @@ function getTop(theitem){
 		offsetTrail = offsetTrail.offsetParent;
 	}
 	if (navigator.userAgent.indexOf("Mac") != -1 && typeof document.body.leftMargin != "undefined") 
-		offsetLeft += document.body.TopMargin;
+		offsetTop += document.body.TopMargin;
 	return offsetTop;
 }