rem: var emailAddress = emailAddressNode.getAttribute("emailAddress"); if (emailAddress) messenger.OpenURL("mailto:" + emailAddress ); 
add: fields.to = emailAddressNode.getAttribute("label"); params.type = Components.interfaces.nsIMsgCompType.New; params.format = Components.interfaces.nsIMsgCompFormat.Default; params.composeFields = fields; msgComposeService.OpenComposeWindowWithParams(null, params); 
context: function SendMailToNode(emailAddressNode){  if (emailAddressNode)  {     var emailAddress = emailAddressNode.getAttribute("emailAddress");     if (emailAddress)        messenger.OpenURL("mailto:" + emailAddress );  }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/cf1c5d07bf4a371812b42251724b3308dc610c0b/msgHdrViewOverlay.js/clean/mailnews/base/resources/content/msgHdrViewOverlay.js