.bg
{
   background-image: url(../img/bg_home.jpg);
   background-repeat:no-repeat;
   position:absolute;
   top:50%;
   left:50%;
   width: 1920px;
   height:900px;
   margin-left:-960px;
   margin-top:-450px;
   overflow:hidden; 
}

.slideshow img
{
    margin-left:0px;
    margin-top:6px;
}