function isNetscape()
{
	// convert all characters to lowercase to simplify testing
	var agt=navigator.userAgent.toLowerCase();

	// Note: Opera WebTV and even IE 5.5 spoof Navigator.  We do strict client detection.
	// If you want to allow spoofing, take out the tests for opera and webtv.
	return ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
		&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
		&& (agt.indexOf('webtv')==-1) && (agt.indexOf('msie')==-1));
}