function getBrowserType() {
  isNetscape4 = false;
  isNetscape6 = false; 
  isIE = false;

  var browserName = navigator.appName;
  var browserVer = parseInt(navigator.appVersion);
		
  if (browserVer >= 4) { 
	if (browserName == "Microsoft Internet Explorer") {
	  //any IE later than 4
	  isIE = true;
 	} else if (browserName == "Netscape") {
	  if (browserVer >= 5) {
		isNetscape6 = true;
	  } 
	  else {
		isNetscape4 = true;
	  }
	} else {
	  // Add code here to detect other browsers!!
	}
  } else {
    //Do we care about browser versions < 4?
  }
}