add: document.getElementById('progress-panel').hidden = true; 
context:     onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus)    {      if (aStateFlags & Components.interfaces.nsIWebProgressListener.STATE_START)      {        document.getElementById('compose-progressmeter').setAttribute( "mode", "undetermined" );      }            if (aStateFlags & Components.interfaces.nsIWebProgressListener.STATE_STOP)      {        gSendOrSaveOperationInProgress = false;        document.getElementById('compose-progressmeter').setAttribute( "mode", "normal" );        document.getElementById('compose-progressmeter').setAttribute( "value", 0 );        document.getElementById('statusText').setAttribute('label', '');      }    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/62dd2d1aaa352bf74d1a54b82e7748502b397267/MsgComposeCommands.js/clean/mailnews/compose/resources/content/MsgComposeCommands.js