.foo{}
fieldset.facebook-login-block{display:inline; float:left; width: 290px; text-align: center; }
.facebook-btn{float:left;background-image:url('images/facebook-signing.png');background-repeat:no-repeat;width:150px;height:23px;margin:5px;}
.facebook-btn:hover{background-position:0px -24px;}
.facebook-btn:active{background-position:0px -48px;}