S'ok, worked it out:
if (iType == 1) {
sOutput = sOutput.replace(/\b(http\:\/\/[\w+\.]+[\w+\.\:\/\@\_\?\=\&\-\'\#\%\~\;\,\$\!\+\*]+)/gi,
"<a href=\"http://www.mysite.com/redirect.asp?url=$1\" target=\"_blank\">$1<\/a>");
} else if (iType == 2) {
sOutput = sOutput.replace(/\b(https\:\/\/[\w+\.]+[\w+\.\:\/\@\_\?\=\&\-\'\#\%\~\;\,\$\!\+\*]+)/gi,
"<a href=\"$1\" target=\"_blank\">$1<\/a>");
} else if (iType == 3) {
sOutput = sOutput.replace(/\b(www\.[\w+\.\:\/\@\_\?\=\&\-\'\#\%\~\;\,\$\!\+\*]+)/gi,
"<a href=\"http://www.mysite.com/redirect.asp?url=http://$1\" target=\"_blank\">$1<\/a>");