var winid = Math.round((Math.random() * (5)));
document.write("<A target=_blank HREF='site/open/open.shtml?url=site_"+winid+"'>");
document.write("<IMG alt='Banner System www.lfbs.narod.ru' SRC='site/site_"+winid+".gif' border=0 width=156 height=97>");
document.write("</A>");