<P>select 태그 예제
  <SELECT>
    <OPTGROUP LABEL="select1">  //option 을 그룹지움
      <OPTION value="option1-1">option1-1</OPTION>
      <OPTION value="option1-2">option1-2</OPTION>
      <OPTION value="option1-3">option1-3</OPTION>
      <OPTION value="option1-4">option1-4</OPTION>
    </OPTGROUP>
    <OPTGROUP LABEL="select2">
      <OPTION value="option2-1">option2-1</OPTION>
      <OPTION value="option2-2">option2-2</OPTION>
      <OPTION value="option2-3">option2-3</OPTION>
    </OPTGROUP>
    <OPTGROUP LABEL="select3">
      <OPTION value="option3-1">option3-1</OPTION>
      <OPTION value="option3-2">option3-2</OPTION>
      <OPTION value="option3-3">option3-3</OPTION>
      <OPTION value="option3-4">option3-4</OPTION>
      <OPTION value="option3-5">option3-5</OPTION>
      <OPTION value="option3-6">option3-6</OPTION>
    </OPTGROUP>
  </SELECT>
</P>

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