#wrapper.mbanner{width:1000px; border:0px; margin:0 auto;}

@media only screen and (min-width: 768px) and (max-width: 999px) {
#wrapper.mbanner{width:742px; border:0px; margin:0 auto;}
}
@media only screen and (min-width: 480px) and (max-width: 767px) { 
#wrapper.mbanner{width:450px; border:0px; margin:0 auto;}
}

@media screen and (max-width: 479px) {
#wrapper.mbanner{width:300px; border:0px; margin:0 auto;}
}