checkbox选中,文本框才能输入内容
<input type='checkbox' name='checkbox1' value='7' onclick="account.disabled=!this.checked;if (!this.checked) account.value=''">
<input name='account' value='' size='6' disabled=true>
<input type='checkbox' name='checkbox1' value='7' onclick="account.disabled=!this.checked;if (!this.checked) account.value=''">
<input name='account' value='' size='6' disabled=true>