add:  iframe.setAttribute('src', 'about:blank'); 
context: function select_panel(target) {  var panels_top = document.getElementById('sidebar-panels');  var iframe = document.getElementById('sidebar-content');  var top_headers = panels_top.childNodes;  debug("select_panel("+target+")");  var select_index = find_panel(top_headers, target);  if (!select_index) {    // Target not found. Pick the first panel by default.    // It is at index 1 because the template is at index 0.    debug("select_panel: target not found, choosing last panel, index "+top_headers.length+"\n");    select_index = pick_default_panel(top_headers);    target = top_headers.item(select_index).getAttribute('iframe-src');  }  // Update the content area if necessary.  if (iframe.getAttribute('src') != target) {    iframe.setAttribute('src', target);  }  if (panels_top.getAttribute('open-panel-src') != target) {    panels_top.setAttribute('open-panel-src', target);  }  update_headers(select_index);}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/06c4447eac77d51936c21645c4d01c462fed8606/sidebarOverlay.js/clean/suite/common/sidebar/sidebarOverlay.js