.button_a{display:inline-block; border-width:1px 0; border-color:#BBBBBB; border-style:solid; vertical-align:middle;text-decoration:none; color:#333333;}
.button_b{float:left; background:#e3e3e3; border-width:0 1px; border-color:#BBBBBB; border-style:solid; margin:0 -1px; position:relative;}
.button_c{display:block; line-height:0.6em; background:#f9f9f9; border-bottom:2px solid #eeeeee;}
.button_d{display:block; padding:0.1em 0.6em; margin-top:-0.6em; cursor:pointer;}
.button_a:hover{border-color:#999999;text-decoration:none;}
.button_a:hover .button_b{border-color:#999999;text-decoration:none;}