Code:
/re /msg $chan $snick($chan,1) [color:red]$+[/color] : $$1-

or
Code:
/re /msg $chan [color:red]$+([/color]$snick($chan,1)[color:red],[/color]:[color:red])[/color] $$1-


btw. it's $snicks, not $snick.