rem: var oldHref = linkNode.href; linkNode.href = ""; linkNode.href = oldHref; } 
add: var oldHref = linkNode.getAttribute("href"); if (typeof oldHref == "string") {   linkNode.setAttribute("href", ""); linkNode.setAttribute("href", oldHref); } else {   } } 
context: function markLinkVisited(href, linkNode){   var globalHistory = Components.classes["@mozilla.org/browser/global-history;1"]                               .getService(Components.interfaces.nsIGlobalHistory);   if (!globalHistory.isVisited(href)) {     globalHistory.addPage(href);     var oldHref = linkNode.href;     linkNode.href = "";     linkNode.href = oldHref;   }    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/973e97746ad84072c80092ec24aa5b0d1e5225cb/contentAreaUtils.js/clean/toolkit/content/contentAreaUtils.js