function UA(){
  var v = navigator.appVersion.toLowerCase(), u = navigator.userAgent.toLowerCase(), n = navigator.appName;
  this.mac = (v.indexOf("mac")+1);
  this.win = (v.indexOf("win")+1);
  this.nn = (n == "Netscape");
  this.ie = (n == "Microsoft Internet Explorer");
  this.aol = (u.indexOf("aol")+1);
  this.opera = (u.indexOf("opera")+1);
  this.ver = (this.ie) ? parseFloat(v.split('msie ')[1]) : parseFloat(v);
  this.major = this.ver.toString().split('.')[0];
	this.minor = this.ver.toString().split('.')[1];
	this.v4 = (this.major == 4);
	this.os = (this.mac) ? 'mac' : (this.win) ? 'win' : navigator.platform;
  this.name = (this.nn) ? 'nn' : (this.ie) ? 'ie' : n;
  this.codeName = this.name +'_'+ parseInt(this.ver) + '_'+ this.os;
}
var ua = new UA();

var onloadHandlers = [];
function loadEvents() {
  for(var i=0; i<onloadHandlers.length; i++) {
    eval(onloadHandlers[i]);
  }
}
window.onload = loadEvents;

var onresizeHandlers = [];
function resizeEvents() {
  for(var i=0; i<onresizeHandlers.length;i++) {
    eval(onresizeHandlers[i]);
  }
}
window.onresize = resizeEvents;

function handleResize(init) {
  if(!(document.layers)) return;
  if(init==true) with (navigator) {
    document.pgW=innerWidth;
    document.pgH=innerHeight;
    onresizeHandlers[onresizeHandlers.length] = 'handleResize()';
  }
  else if (innerWidth!=document.pgW || innerHeight!=document.pgH) location.reload();
}
handleResize(true);

function getObjByName(name,doc) {
  var o = 0;
  if(!doc) doc = document;
  if(doc[name]) o=doc[name];
  if(document.all && doc.all[name]) o=doc.all[name];
  if(o) {
    if(!o.getElementsByTagName) o.getElementsByTagName = getElementsArray;
    return o;
  }
  if(document.layers) {
    for(var i=0;i < doc.layers.length;i++){
      var lyrdoc = doc.layers[i].document;
      if(lyrdoc[name]) return lyrdoc[name];
      if(lyrdoc.layers.length > 0) {
        var o = getObjByName(name,lyrdoc);
        if(o) return o;
      }
    }
  }
  return 0;
}
if(!document.getElementById) document.getElementById = getObjByName;

function getElementsArray(el) {
  if(document.layers) {
    var doc = (this == document) ? document : this.document;
    switch(el) {
      case 'img' : return doc.images;
      case 'a' : return doc.links;
      case 'div' : return doc.layers;
      case 'form' : return doc.forms;
      default : return 0;
    }
  }
  if(document.all) return this.all.tags(el);
  return 0;
}
if(!document.getElementsByTagName) document.getElementsByTagName = getElementsArray;
if(document.layers) Layer.prototype.getElementsByTagName = getElementsArray;

function show(div){
  if(document.all) window.document.all[div].style.visibility = 'visible';
  else if(document.layers) getObjByName(div).visibility = 'show';
  else document.getElementById(div).style.visibility = 'visible';
}
function hide(div){
  if(document.all) window.document.all[div].style.visibility = 'hidden';
  else if(document.layers) getObjByName(div).visibility = 'hide';
  else document.getElementById(div).style.visibility = 'hidden';
}

function swapImg() {
  if(!document.images) return;
  var args = swapImg.arguments;
  for(var i=0;i < args.length;i+=2) {
    var imgSrc = (args[i + 1].indexOf('[') != -1) ? eval(args[i + 1] + '.src') : args[i + 1];
    if(getObjByName(args[i])) getObjByName(args[i]).src = imgSrc;
  }
}


// This function from has been modified to take a single string of all images separated by commas
/*function preLoad(a) {
  var o = [];
  alert ('inside preload....') ;
  for(var i=0; i<a.length; i++) {
    o[i] = new Image();
    o[i].src = '/images/'+a[i]+'_1.gif';
	alert('preloading /images/'+a[i]+'_1.gif') ;
  }
}*/

function preLoad(str) {
  var a = str.split(',') ;
  var o = [];
  for(var i=0; i<a.length; i++) {
    o[i] = new Image();
    //o[i].src = '/images/'+a[i]+'_1.gif';
    o[i].src = a[i]+'_1.gif';
  }
}
/*
preLoad('navigation/topnav/nav_top_0,navigation/topnav/nav_top_1,navigation/topnav/nav_top_2,navigation/topnav/nav_top_3,navigation/topnav/nav_top_4,navigation/topnav/nav_top_5');
*/

preLoad('/images/navigation/topnav/nav_top_0,/images/navigation/topnav/nav_top_1,/images/navigation/topnav/nav_top_2,/images/navigation/topnav/nav_top_3,/images/navigation/topnav/nav_top_4');

function openNASAWindow(url)
{
  if (url != "#")
  {
    var positionX = screen.width;
    var positionY = ((screen.height)/2);

    var sizeX = 720;
    var sizeY = 640;
    
    var strWindowFeatures = "";
    strWindowFeatures += 'menubar=yes,location=yes,toolbar=yes,directories=yes,scrollbars=yes,status=yes,resizable=yes,outerWidth='+720+',outerHeight='+640+',width='+720+'height='+640+',left='+80+',top='+60+'screenX='+80+',screenY='+60;
    winPopupWindow = window.open(url, "nasawindow", strWindowFeatures);
    winPopupWindow.focus();
  }
}


// Function added from flash.js

var swf = false;
function hasFlash(ver) {
  if(!ver) ver = 0;
	var n = navigator;
  if(n.plugins && n.plugins.length > 0) {
    var m,t,d,v;
    m = n.mimeTypes;
    t = 'application/x-shockwave-flash';
    if(m && m[t] && m[t].enabledPlugin && m[t].enabledPlugin.description) {
      d = m[t].enabledPlugin.description;
      v = d.charAt(d.indexOf('.')-1);
			swf = (v >= ver) ? true : false;
    }
  } else if(n.appVersion.indexOf("Mac") == -1 && window.execScript) {
    for(var i=ver; i<=7&&i!=1&&swf!=true; i++) {
      execScript('on error resume next: swf=IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash'+((i==0)?'':'.'+i)+'"))','VBScript');
    }
	} else {
	  swf = false;
	}
	return swf;
}

// Function added from multimedia.js

function NewWindow(mypage, myname, w, h, scroll) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
	win = window.open(mypage, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}


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();
}
MM_reloadPage(true);

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}