.default_tab{
display:none;
}
.default_tab_update{
display:block;
background-image: url("../picture/support/update.png");
width:160px;
height:32px;
float:left;
}
.default_tab_notice{
display:block;
background-image: url("../picture/support/notice_.png");
width:160px;
height:32px;
float:left;
}