.input_err {color:red;}    
.input_suc{color:black;} 
.purpose {font-size:12px;line-height:24px;}
.purpose textarea {font-size:18PX; border:1px #bbb solid; width:460px}
.purpose .let { background:transparent; cursor:pointer; border:1px #10354e solid;background:#10354e; background:-webkit-linear-gradient(top, #0a4369, #10354e); background:-moz-linear-gradient(top, #0a4369, #10354e); box-shadow:inset 0 1px 0 rgba(255,255,255,0.2), 0 1px 2px rgba(0,0,0,0.05); color:#fff; padding:4px 8px; border-radius:3px; font-weight:bold}
.purpose .let:hover{opacity:0.9; filter:Alpha(opacity=90);}