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;
  }
}


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;
}

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 preLoad(a) {
  var o = [];
  for(var i=0; i<a.length; i++) {
    o[i] = new Image();
    o[i].src = '/images/'+a[i]+'_1.gif';
  }
}


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(); }
}