LSL Wiki : llLoadURL

llLoadURL(key avatar_id, string message, string url)

llLoadURL displays a dialog box to the user offering to load a web page using the default web browser.

The URL given must begin with "http://" or "https://"; it will not work with other protocols such as ftp, telnet, secondlife, etc. If a user mutes an object, they will not receive any URL offers from that object. (Note: For those still running the pre-voice clients (1.18.0(6) or less; for UI or Voice incompatibility reasons?), muting the object or avatar does NOT stop llLoadURL boxes from appearing.)

Notes:
The url is truncated to 255 characters and message is truncated to 254 characters.
This function delays the script for 10 seconds.
This function only works on a user within the same sim as the object calling it.

Example:

default
{
    touch_start(integer total_number)
    {
        llLoadURL(llDetectedKey(0), "Flame on!", "http://forums.secondlife.com");
    }
}

Q: Can I use this with a secondlife:// URL?
A: No, use llMapDestination to do that.

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Functions | Communications | HTTP