html, body, #container {
min-height: 100%; /* Not supported by IE 5/6, but required for Firefox/Opera */
width: 99%;
height: 100%;
}

html>body, html>body #container {
height: auto;
}
body {
margin: 0;
}
#container {
position: absolute;
top: 0;
left: 0;
}

#header {

width: 100%;
height: 80px;
text-align:center;
vertical-align:bottom;
}
#tab {
width: 100%;
text-align:center;
vertical-align:top;
}

#footer {
position: absolute;
bottom: 0;
left:0;
width: 100%;

vertical-align:bottom;
text-align:center;
}