Index: branches/5.1.x/core/admin_templates/js/script.js
===================================================================
diff -u -N -r13667 -r14147
--- branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 13667)
+++ branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 14147)
@@ -1497,8 +1497,14 @@
 
 NumberFormatter.Parse = function(num)
 {
-	if (num == '') return 0;
-	return parseFloat( num.toString().replace(this.ThousandsSep, '').replace(this.DecimalSep, '.') );
+	if (num == '') {
+		return 0;
+	}
+
+	var $string = num.toString();
+
+	// we could have multiple thousand separators !
+	return parseFloat( $string.replace(new RegExp(this.ThousandsSep, 'g'), '').replace(this.DecimalSep, '.') );
 }
 
 NumberFormatter.Format = function(num)