rem: if (enable) { checkbox.removeAttribute("disabled"); numberFld.removeAttribute("disabled"); } else { checkbox.setAttribute("disabled", "true"); numberFld.setAttribute("disabled", "true"); } 
add: checkbox.disabled = !enable; numberFld.disabled = !enable; 
context: function setupDownloadUI(enable) {    var checkbox = document.getElementById("markread");    var numberFld = document.getElementById("number");    if (enable) {        checkbox.removeAttribute("disabled");        numberFld.removeAttribute("disabled");    }    else {        checkbox.setAttribute("disabled", "true");        numberFld.setAttribute("disabled", "true");    }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/9ffb9ffba3a9ebeaa844ef6d78b89cc6d28c93e8/downloadheaders.js/clean/mailnews/news/resources/content/downloadheaders.js