//Detect IE5.0+
if (navigator.appVersion.indexOf("MSIE")!=-1){
  temp=navigator.appVersion.split("MSIE");
  version=parseFloat(temp[1]);
  if (version>=5){ //NON IE browser will return 0
    //alert("You're using IE5.0+")
  } else {
    alert("You are using an older version of web browser, which may not be to display this web page correctly.\nPlease consider upgrading your browser."); 
  }
} else {
//Detect  Netscape 5.0+
  if (navigator.appName=="Netscape"&&parseFloat(navigator.appVersion)>=5.0){
    //alert("You are using Netscape 5+");
    document.write("<style>");
    document.write("ul, li {margin-left: 0px}");
    document.write("</style>");
  } else {
    alert("You are using an older version of web browser, which may not be to display this web page correctly.\nPlease consider upgrading your browser."); 
  }
}