div.button{ cursor:pointer;cursor:hand; color:#fff;text-align:center;padding-top:4px; font-size:16px}   
div.left_button {
    z-index:1;
    background:#182e52;      
 }
 
div.right_button {
    background:#3e5c82;
    z-index:0;   
 } 
 
div.activ {z-index:20;background:#182e52;}
div.noactiv {z-index:10;background:#3e5c82;}