how can i add footer image?

my bg image runss to the end of the page
how can i set it to auto?
so that it grows with the forum?

how can i add footer image?
http://highschooljamz.org

#punwrap{background:url(../../img/DarkBlue/p6_bg.gif)}
.pun{background:url()}
#brdtitle {background:url(../../img/DarkBlue/bg1.gif)}
#brdmenu li {background:url(../../img/DarkBlue/list.gif)}
h2{background:url(../../img/DarkBlue/3h31.gif)}
h2 span {background:url(../../img/DarkBlue/h2_icon.gif)}
h2 span .conr {background:none;}
div#footextra{color:#555;}
#brdfooter{background:url(../../img/DarkBlue/bg_copy.gif);
    background-repeat: no-repeat;
}