var ua=navigator.userAgent.toLowerCase();
var is_ie = (ua.indexOf("msie") != -1);
var is_opera = (ua.indexOf("opera") != -1);
var is_gecko = (ua.indexOf('gecko') != -1);
var is_net = (ua.indexOf('mozilla') != -1);
function check_browser(){
var good = false;
if (document.getElementById)
{
// browser implements part of W3C DOM HTML
// Gecko, Internet Explorer 5+, Opera 5+
good= true;
}
else if (document.all)
{
// Internet Explorer 4 or Opera with IE user agent
good=false;
}
else if (document.layers)
{
// Navigator 4
good=false;
}
return good;
}
function alert_browser_window(){
var good= check_browser();
var ua=navigator.userAgent.toLowerCase();
var is_ie = (ua.indexOf("msie") != -1);
var is_opera = (ua.indexOf("opera") != -1);
if( !good){
if( is_ie || is_opera){ height= 250; }
else {height=220;}
var wd=window.open("about:blank","Check_Browser",
"alwaysRaised=yes,width=450,height="+height);
wd.document.write(
alert_browser_header()+
"Close this window"+
alert_browser_text()+
alert_browser_footer());
}
return good;
}
function alert_browser_insert(){
var good= check_browser();
if( !good){
document.write(alert_browser_text());
}
return good;
}
function alert_browser_text() {
return '