cause i want to post it on websites

You use:
<a href="irc://the.server.name/thechannel" target="_blank">irc://the.server.name/thechannel</a>

For example,
<a href="irc://irc.myserver.com/chatland" target="_blank">irc://irc.myserver.com/chatland</a>

That would bring you to #chatland on irc.myserver.com

alias geturl {
if (irc.*.* iswm $network) {
return irc:// $+ $network $+ / $+ $chan
}
else {
return irc:// $+ $server $+ / $+ $chan
}
}
//echo -a $geturl

I think the original poster wanted a java applet.