add: document.getElementById("imip-button1").setAttribute("hidden", "true"); document.getElementById("imip-button2").setAttribute("hidden", "true"); 
context: function onImipStartHeaders(){    var imipBar = document.getElementById("imip-bar");    imipBar.setAttribute("collapsed", "true");    // A new message is starting.    // Clear our iMIP/iTIP stuff so it doesn't contain stale information.    imipMethod = "";    gItipItem = null;}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/a43eedf9671928b5eeab01d2060178f08be8b053/imip-bar.js/clean/calendar/lightning/content/imip-bar.js