button.sns_button {
	height: 20px;
	width: 20px;
	background-color:transparent;
	border:none;
	padding:none;
	margin:none;
	vertical-align: middle;
	/*background-image:url(../image/socialbuttons.png);*/
	background-repeat:no-repeat;
}
button.sns_button:hover {
	cursor:pointer;
}
button.sns_button span {
	display:none;
}
button.sns_button.facebook {
	background-image:url(../image/facebook.jpg);	
}
button.sns_button.twitter {
	background-image:url(../image/twitter.png);	
}
.ie7 button.sns_button.twitter {
	margin-left:4px;
}