div.center 
{
width:978px;
margin-right: auto;
margin-left: auto; 
text-align: center;
}

div.right 
{
width:978px;
margin-right: 0px;
margin-left: auto; 
text-align:right;
}

div.left 
{
margin-right: auto;
margin-left: 0px; 
text-align:left;
}