ul,li
{
 margin:0;
 padding:0;
 list-style:none;   
    
}

#ul li
{
    float:left;
    background-color:#D7DDDD;
    color:black;
    padding:5px;
    margin-right:2px;
    border:1px solid white;
}

#ul li.tabin
{
    background-color:#F2F8FD;
    border:1px solid #F2F8FD;
}

div.contentfirst
{
    clear:left;
    padding:10px;
    background-color:#F2F8FD;
    color:black;
    display:none;
    width:790px;
    height:455px;
}

div.contentin
{
   display:block;
}