var ver3; 
if (navigator.appVersion.charAt(0)<= "3")
  ver3 = true
else
  ver3=false

var dom
if (document.getElementById)
  dom = true
else
  dom = false

var ie4 
if (navigator.appVersion.indexOf("MSIE 4") != -1) 
  ie4=true
else
  ie4=false

var ns4
if (document.layers)
  ns4=true
else
  ns4=false

var ie5 
if (navigator.appVersion.indexOf("MSIE 5") != -1) 
  ie5=true
else
  ie5=false

var n6 
if (document.getElementById && !document.all)
  var n6=true
else
  var n6=false

var ie6 
if (navigator.appVersion.indexOf("MSIE 6") != -1)
  var ie6=true
else
  var ie6=false

var ie7 
if (navigator.appVersion.indexOf("MSIE 7") != -1)
  var ie7=true
else
  var ie7=false

var op7
if (navigator.userAgent.indexOf("Opera 7") != -1)
  var op7=true
else
  var op7=false

var msie
if (navigator.userAgent.indexOf("MSIE") != -1)
  var msie=true
else
  var msie=false

function LoadScript(url){
   document.write('<script src="', url, '" type="text/javascript"><\/script>');
   }