add: case "prefetch": return null;  
context: LinkToolbarHandler.getLinkType =function(relAttribute){  switch (relAttribute.toLowerCase()) {    case "start":    case "top":    case "origin":      return "top";    case "up":    case "parent":      return "up";    case "begin":    case "first":      return "first";    case "next":    case "child":      return "next";    case "prev":    case "previous":      return "prev";    case "end":    case "last":      return "last";    case "author":    case "made":      return "author";    case "contents":    case "toc":      return "toc";    default:      return relAttribute.toLowerCase();  }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/df5865dc4e89bed8f365d6df92a5f093f0d05278/linkToolbarHandler.js/buggy/xpfe/browser/resources/content/linkToolbarHandler.js