syntax question

[eluser]Dam1an[/eluser]
That depends if you're talking about a new line as it would appear in a file or a line break on a website
If it's the first, you just put either \n or \r\n as part of the concatenated string for UNIX and windows respectively, you need to do this in double quotes so that it gets interpreted correctly.
If it's the latter, just add <b r /> (remove space between b and r) as part of the string, this can be as part of a string in single or double quotes