var ns = ((navigator.appName == 'Netscape') || (navigator.appName == 'FireFox'));
var wnd;

  img1on=preload('images/abell3a.gif');
  img1off=preload('images/abell3.gif'); 

function preload(img) 
{
  var im = new Image();
  im.src = img;
  return im; 
}

function emlk(n, d, s)
{
	var a = n+'@'+d;
	var t = s==null?a:s;
	document.write('<a href="mailto:'+a+'">'+t+'</a>');
}

function splash(num)
{
  var props = 'dependent=yes,width=340,height=300,left=240,top=200,titlebar=no,status=no,menubar=no,toolbar=no,directories=no,scrollbars=no,location=no,resizable=no';
  var url = 'splash'+num+'.html';
  if (num > 0)
  { wnd=window.open(url, 'splash', props);
  }
}

function mover(n)
{
	var im = 'img'+n;
	var el = 'nav'+n;
	document.getElementById(el).className = 'nava';
	document.getElementById(im).src = img1on.src;
}

function mout(n)
{
	var im = 'img'+n;
	var el = 'nav'+n;
	document.getElementById(el).className = 'nav';
	document.getElementById(im).src = img1off.src;
}

function popWnd(url, w, h)
{
  var props = 'dependent=no,width='+w+',height='+h+',left=40,top=20,titlebar=no,status=yes,menubar=no,toolbar=no,directories=no,scrollbars=yes,location=no,resizable=yes';
  wnd=window.open(url, 'popup', props);
}