checkbox 选中，后面的多个textarea提示必填，请高手帮忙

[efanlx]

checkbox 选中，后面的多个textarea提示必填，由于那些事项都是从数据库里读出来的，个数无限制的。
请高手帮忙解决，急！感谢！

<tr>
<td bgcolor="#FFFFFF" class="f_c">事项<Input type="hidden" name="id_1" id="id_1" value="2"></td>
<td bgcolor="#FFFFFF" colspan="4">
<table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#c7e9ff">
<tr>
<td bgcolor="#FFFFFF" width="35%"><input type="checkbox" name="id_1[]" id="id_1" value="A">  A、项目1</td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="name_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="bsfs_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="17%"><textarea name="synx_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
</tr>
<tr>
<td bgcolor="#FFFFFF" width="35%"><input type="checkbox" name="xtgn_1[]" id="xtgn_1" value="B">  B、项目2</td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="name_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="bsfs_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="17%"><textarea name="synx_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
</tr>
<tr>
<td bgcolor="#FFFFFF" width="35%"><input type="checkbox" name="xtgn_1[]" id="xtgn_1" value="C">  C、项目3</td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="name_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="bsfs_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="17%"><textarea name="synx_1" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
</tr>
</table>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" class="f_c">成效<Input type="hidden" name="id_2" id="id_2" value="2"></td>
<td bgcolor="#FFFFFF" colspan="4">
<table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#c7e9ff">
<tr>
<td bgcolor="#FFFFFF" width="35%"><input type="checkbox" name="id_2[]" id="id_2" value="A">  A、成效1</td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="name_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="bsfs_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="17%"><textarea name="synx_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
</tr>
<tr>
<td bgcolor="#FFFFFF" width="35%"><input type="checkbox" name="xtgn_2[]" id="xtgn_2" value="B">  B、成效2</td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="name_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="24%"><textarea name="bsfs_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
<td bgcolor="#FFFFFF" width="17%"><textarea name="synx_2" class="comments" style="height:expression((this.scrollHeight>150)?'150px':(this.scrollHeight+16)+'px');overflow:auto;"></textarea></td>
</tr>
</table>
</td>
</tr>


</table>

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