html, body {height: 100%;}

#wrap {min-height: 100%;}

#main_wrap {
    overflow:auto;
    padding-bottom: 85px;
}  /* must be same height as the footer */

#footer {
    position: relative;
    margin-top: -85px; /* negative value of footer height */
    height: 85px;
    clear:both;
} 

/*Opera Fix*/
body:before {
    content:"";
    height:100%;
    float:left;
    width:0;
    margin-top:-32767px;
}