DIV Pai ñ acompanha seus filhos

html
 body
  total
   box_maior
    laterala 
    lateral_dir

html{
height:100%;}
body {
        background-color: #142c35;
        background-image:url(../images/footer.jpg);
        background-repeat:no-repeat;
        background-position:bottom;
        background-attachment:inherit;
        height:100%;
        }
#total{
        
        }
#box_maior{
        background-image:url(../images/box_maior_05.png);
        background-repeat:no-repeat;
        background-position:top;
        min-height:233px;
        height:100%;
        width:880px;
        margin-left:auto;
        margin-right:auto;
        padding-top:15px;
        padding-left:30px;
        padding-right:30px;
        font-family:Verdana, Arial, Helvetica, sans-serif;
        font-size:10px;
        color:#FFFFFF;
        margin-top:12px;
        
                }
#lateral{
        width:200px;
        min-height:100px;
        background-color:#FFFFFF;
        border-width:thick;
        border-style: solid;
        border-color:#000000;
        float:left;
}               
#lateral_dir{
        width:620px;
        padding-left:15px;
        padding-right:15px;
        padding-top:20px;
        min-height:100px;
        background-color:#FFFFFF;
        border-width:thick;
        border-style: solid;
        border-color:#000000;
        float:right;
        margin-left:10px;
        color:#666666;
}