rem: var contentWindow = window.top._content; 
add: var contentWindow = window.top.content; 
context: function SpaceHit(event){  var contentWindow = window.top._content;  if (event && event.shiftKey) {    // if at the start of the message, go to the previous one    if (contentWindow.scrollY > 0) {      contentWindow.scrollByPages(-1);    }    else {      goDoCommand("cmd_previousUnreadMsg");    }  }  else {    // if at the end of the message, go to the next one    if (contentWindow.scrollY < contentWindow.scrollMaxY) {      contentWindow.scrollByPages(1);    }    else {      goDoCommand("cmd_nextUnreadMsg");    }  }}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/766d404cfe3d0b6d61d9fede0b76e1d13ab33d52/mailWindowOverlay.js/buggy/mailnews/base/resources/content/mailWindowOverlay.js