rem: if (enable) { checkbox.removeAttribute("disabled"); numberFld.removeAttribute("disabled"); } else { checkbox.setAttribute("disabled", "true"); numberFld.setAttribute("disabled", "true"); } 
add: if (enable) { checkbox.removeAttribute("disabled"); numberFld.removeAttribute("disabled"); } else { checkbox.setAttribute("disabled", "true"); numberFld.setAttribute("disabled", "true"); } 
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/a24ffe4299da83b8595086d55466b8f10e68198d/downloadheaders.js/clean/mailnews/news/resources/content/downloadheaders.js