// css

	var linkRef = "http://www.usc.edu/dept/earth/";

if (navigator.appName=="Netscape") { if (parseInt(navigator.appVersion)==4) { linkCSS("menu/menuNS4.css"); } else if (parseInt(navigator.appVersion)>4) { linkCSS("menu/menuNS6.css"); } } else { if (navigator.platform=="Win32") { linkCSS("menu/menuIEWin.css"); } }
// 2L menus
var activeM="",activeBG=0; 
function showM() {
 var a=showM.arguments[0];
 hideM();
 if (a.length) {
  MM_swapImage(''+a,'',linkRef+'images/'+a+'-a.gif',1);
  MM_showHideLayers('uschead'+a,'','show','uscheadMX1','','show','uscheadMX2','','show'); 
  activeM=a;
  if (!(activeBG)) {
   MM_swapImage('uscheadMbg','',linkRef+'images/grey.gif',1);
   activeBG=1;
  }
 }
}
function hideM() {
 if (activeM) { 
  MM_showHideLayers('uschead'+activeM,'','hide'); 
  MM_swapImage(''+activeM,'',linkRef+'images/'+activeM+'.gif',1); 
  activeM = "";
 }
}
function hideX() {
 MM_showHideLayers('uscheadMX1','','hide','uscheadMX2','','hide');
 MM_swapImage('uscheadMbg','',linkRef+'images/spacer.gif',1);
 activeBG=0;
}
function preloadM() {
 var a=linkRef+'images'; 
 MM_preloadImages(a+'grey.gif',a+'M1-a.gif',a+'M2-a.gif',a+'M3-a.gif',a+'M4-a.gif',a+'M5-a.gif',a+'M6-a.gif',a+'M7-a.gif',a+'M8-a.gif'); 
}