// Populating images array
var images = [];
for (var i = 0; i <= 1; i++) {
   images[i] = i + '.jpg';
}
var index =  Math.floor(Math.random() * images.length);
var altIndex = Math.abs(index - 1);
var loaded = '/images/' + index + '.jpg';
var alternate = '/images/' + altIndex + '.jpg';
var alternateOpacity = 0;
var intervalId;

// Remembering state of menus
var cookies = new Array("information", "observing", "research", "applications", "instrumentation", "healthsafety", "facilitysystems", "transportation", "hawaiimaps", "weather", "photogallery", "irtfOnly", "contact");
MM_reloadPage(true);

function createCookie(name,value,days) {
   if (days) {
      var date = new Date();
      date.setTime(date.getTime()+(days*24*60*60*1000));
      var expires = "; expires="+date.toGMTString();
   } else var expires = "";
   document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
   var nameEQ = name + "=";
   var ca = document.cookie.split(';');
   for (var i=0;i < ca.length;i++) {
      var c = ca[i];
      while (c.charAt(0)==' ') c = c.substring(1,c.length);
      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
   }
   return null;
}

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
   if (init==true) with (navigator) {
      if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
      document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage;
      }
   }
   else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}

function fadeIn() {
   intervalId = setInterval("doFade()", 1);
}

function doFade(obj) {
   if (navigator.appName.indexOf("Microsoft")==-1) {
      document.images.fade.style.MozOpacity = alternateOpacity / 100;
   } else {
      document.images.fade.style.filter = 'alpha(opacity=' + alternateOpacity + ')';
   }
   alternateOpacity +=.5;
   if ((alternateOpacity>= 100 && navigator.appName.indexOf("Microsoft")!=-1) || (alternateOpacity /100>= 1 && navigator.appName.indexOf("Microsoft")==-1) ) {
      clearInterval(intervalId);
   }
}

function startShow() {
   initFlags();
   MM_preloadImages('/images/contact.gif', '/images/informationOpen.gif', '/images/observingOpen.gif', '/images/researchOpen.gif', '/images/applicationsOpen.gif', '/images/instrumentationOpen.gif', '/images/facilitysystemsOpen.gif', '/images/transportationOpen.gif', '/images/hawaiimapsOpen.gif', '/images/weatherOpen.gif', '/images/photogalleryOpen.gif', '/images/irtfOnlyOpen.gif');
   //        MM_preloadImages('images/contact.gif', 'images/informationOpen.gif', 'images/observingOpen.gif', 'images/researchOpen.gif', 'images/applicationsOpen.gif', 'images/instrumentationOpen.gif', 'images/facilitysystemsOpen.gif', 'images/transportationOpen.gif', 'images/hawaiimapsOpen.gif', 'images/weatherOpen.gif', 'images/photogalleryOpen.gif', 'images/irtfOnlyOpen.gif');
   //        MM_preloadImages('images/contactOn.gif', 'images/informationOn.gif', 'images/observingOn.gif', 'images/researchOn.gif', 'images/applicationsOn.gif', 'images/instrumentationOn.gif', 'images/facilitysystemsOn.gif', 'images/transportationOn.gif', 'images/hawaiimapsOn.gif', 'images/weatherOn.gif', 'images/photogalleryOn.gif', 'images/irtfOnlyOn.gif');
   document.images.banner.src = loaded;
   document.images.fade.style.filter = 'alpha(opacity=0)';
   document.images.fade.style.MozOpacity = 0;
   document.images.fade.src = alternate;
   //    document.images.fade.style.visibility = 'visible';
   document.images.fade.style.filter = 'alpha(opacity=' + alternateOpacity + ')';
   document.images.fade.style.MozOpacity = alternateOpacity;
   fadeIn();
   for (i=0; i<cookies.length; i++) {
      if (readCookie(cookies[i]) == "true") {
         toggleArrow(cookies[i]);
      }
   }
}