diff --git a/www/include/common/javascript/tool.js b/www/include/common/javascript/tool.js
index 690d6f2c3e555e4e96c53e12a7f4f55e8f1f5ec7..484f1e8ac15dbfb7ce14332647e6948bb25b2ff9 100644
--- a/www/include/common/javascript/tool.js
+++ b/www/include/common/javascript/tool.js
@@ -193,7 +193,7 @@ function setDisabledRowStyle(img)
 			var img = "enabled.png";
 		}
         jQuery('img[src$="enabled.png"]').each(function(index) {
-            jQuery(this).parent().parent().parent().className('row_disabled');
+            jQuery(this).parent().parent().parent().addClass('row_disabled');
 		});
 	});
 }