Opera-detect

if ((navigator.userAgent).indexOf(\"Opera\")!=-1) {
document.write(\"You are using an Opera browser.\")
}

Taget fra:

document.write(\'navigator.appName = \'+navigator.appName+\'<br>\')
document.write(\'navigator.userAgent = \'+navigator.userAgent+\'<br>\')

if ((navigator.userAgent).indexOf(\"Opera\")!=-1) {
document.write(\"You are using an Opera browser.\")
}
else if (navigator.appName==\"Netscape\") {
document.write(\"You are using a Netscape browser.\")
}
else if ((navigator.appName).indexOf(\"Microsoft\")!=-1) {
document.write(\"You are using Microsoft Internet Explorer.\")
}

Taark! :)