Index: trunk/kernel/admin_templates/incs/script.js
===================================================================
diff -u -r5248 -r5494
--- trunk/kernel/admin_templates/incs/script.js	(.../script.js)	(revision 5248)
+++ trunk/kernel/admin_templates/incs/script.js	(.../script.js)	(revision 5494)
@@ -1019,3 +1019,17 @@
 		$dst_element.appendChild($new_element);
 		return $new_element;
 	}
+	
+	Math.sum = function($array) {
+		var $i = 0;
+		var $total = 0;
+		while ($i < $array.length) {
+			$total += $array[$i];
+			$i++;
+		}
+		return $total;
+	}
+	
+	Math.average = function($array) {
+		return Math.sum($array) / $array.length;
+	}