#head .social_bar{float:right;width:120px;height:60px;}
#head .social_bar .social{float:left;display:block;width:60px;height:60px;background:url(img/sar_social.png) no-repeat;text-indent:-9999px;overflow:hidden;}
#head .social_bar .tw{background-position:right bottom;}
#head .social_bar .tw:hover{background-position:left bottom;}
#head .social_bar .fb{background-position:right top;}
#head .social_bar .fb:hover{background-position:left top;}