body {
margin:0 auto;
padding:0;
text-align:center; 
}

#wrap {
width:100%; 
min-width: 980px;
text-align:left;
width:expression(document.body.clientWidth < 980? "980px": "auto" );
}

#header {
float:left;
width:100%;
height: 280px;
clear:both;
}

#footer {
float:left;
height: 60px;
width: 95%;
clear:both;
}

#mainbody {
float:left;
width:100%;
clear:both;
}

#navi {
float:left;
width:25%;
}

#content {
margin-left: 25%;
margin-right: 5%;
}