.txt_head{font-size:18px; line-height:32px; font-weight:normal;}

.txt18{font-size:15px; line-height:19px; }
.txt18w{font-size:15px; line-height:26px; }
.txt18n{font-size:15px; line-height:18px; }
.txt18ww{font-size:15px; line-height:32px; }

.txt16{font-size:13px; line-height:19px; }
.txt16w{font-size:13px; line-height:26px; }
.txt16n{font-size:13px; line-height:17px; }