$var = preg_replace('#\[YT\](.*?)\[/YT\]#si', '<object width="400" height="380">
<param name="movie" value="http://www.youtube.com/v/\1?rel=1&color1=34c924&
color2=3caa3c&border=1&fs=1"></param>
<param name="allowFullScreen" value="true&
.gif)
) 
