var timerOn = false; 
var timecount = 4000; 

function hidenav(thislayer) {  if (timerOn == false) {   timerID=setTimeout("disappearnav('"+thislayer+"')", timecount);   timerOn = true;   }  }                                                                                                                                              
function shownav(thislayer) { appearnav(thislayer);  if (timerOn) {  clearTimeout(timerID);   timerID = null;   timerOn = false;  }  } 

function disappearnav(thislayer) { MM_showHideLayers(''+thislayer+'','','hide', 'officeBackground','','hide');}

function appearnav(thislayer) { MM_showHideLayers(''+thislayer+'','','show', 'officeBackground','','show');}