rem:  document.getElementById("pop3.deleteMailLeftOnServer").disabled = !checked; 
add: var locked = getAccountValueIsLocked(document.getElementById("pop3.leaveMessagesOnServer")); document.getElementById("pop3.deleteMailLeftOnServer").disabled = locked || !checked ; 
context: function setupMailOnServerUI(){    var checked = document.getElementById("pop3.leaveMessagesOnServer").checked;   document.getElementById("pop3.deleteMailLeftOnServer").disabled = !checked;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/b8e380d020d466d68a4597e0838d1371a056982d/am-server.js/clean/mailnews/base/prefs/resources/content/am-server.js