<script LANGUAGE="java script">
<!-- Begin
function test(form) {
if (form.text.value == "")
alert("你喜欢的颜色是什么?")
else {
document.bgColor=(""+form.text.value+"");
   }
}
// End -->
</script>
<form>
<div align="center"><center>
</center>
  <table border="1" width="100%" bordercolorlight="#000000" cellspacing="0" bordercolordark="#FFFFFF" cellpadding="0">
    <tr>
      <td width="50%">
        <p align="right"><font size="2">请输入颜色代码：</font></td>
      <center>
      <td width="50%">
      <input type="text" name="text" size="20" style="border: 1 dotted #008000"> <input type="button" name="button" value="生效" onClick="test(this.form)"> </td>
      </tr>
    </table>
</center>
</div>
</form>