셀렉트 옵션을 그룹화

<select name="language">
    <optgroup label="선택하세요" style="color:orange"></optgroup>
    <optgroup label="Web" style="color:green">
        <option>ASP
        <option>PHP
        <option>JSP
    </optgroup>
    <optgroup label="Window" style="color:blue">
        <option>VB
        <option>C++
        <option>JAVA
    </optgroup>
</select>

출처 : http://blog.naver.com/tear230/100009982925