//msie_ver = navigator.userAgent.substring(25,33);
userAgernt_arr = navigator.userAgent.split(";");
msie_ver = userAgernt_arr[1].substring(1);
msie_ver_arr = userAgernt_arr[1].split(" ");
msie_ver_id = msie_ver_arr[1];
msie_ver_no = parseFloat(msie_ver_arr[2]);
//alert("userAgent=[" + navigator.userAgent + "]" + "  msie_ver=[" + msie_ver + "]" + "  msie_ver_id=[" + msie_ver_id + "]" + "  msie_ver_no=[" + msie_ver_no + "]");
//if ( msie_ver.substr(0,4) != "MSIE" || msie_ver < "MSIE 5.5" ) {
if ( msie_ver_id != "MSIE" || msie_ver_no < 5.5 ) {
        alert("Your Browser Must be Internet Explorer 5.5 or greater");
        self.close();
}



// old...
<script language="JavaScript"><!--
//alert("common/wbt_t21header (" + navigator.userAgent + ")");
	var msie_ver_arr = navigator.userAgent.match(/ MSIE (.\..)/);
	var msie_ver = 0;
	if ( msie_ver_arr != null ) {
		if ( msie_ver_arr.length == 2 )
			msie_ver = parseInt(msie_ver_arr[1]);
		//alert("msie_ver=[" + msie_ver + "]");
	}
	if ( msie_ver < 5.5 ) {
		alert("Your Browser Must be Internet Explorer 5.5 or greater")
		self.close();
	}
//--></script>