html,body,#bg,#bg table,#bg td,#cont{width:100%;height:100%;}



#bg div{position:absolute;width:200%;height:100%;top:0;left:-50%}
#bg td{vertical-align:top;text-align:center;padding-top:0px;}
#bg img{min-height:100%;min-width:50%;margin:0 auto}