rem: var checkbox = document.getElementById('markAsRead'); textbox.disabled = !checkbox.checked; 
add: textbox.disabled = !document.getElementById('markAsRead').checked; 
context:   updateMarkAsReadTextbox: function(aFocusTextBox)   {    var textbox = document.getElementById('markAsReadDelay');     var checkbox = document.getElementById('markAsRead');    textbox.disabled = !checkbox.checked;    if (!textbox.disabled && aFocusTextBox)        textbox.focus();  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/58f6347733c6dc899713408fe16d6641419bf688/advanced.js/clean/mail/components/preferences/advanced.js