javascriptでCSS切り替えてるだけ
[sourcecode language="java"]<dl>
<dt><label for="name">name:</label></dt>
<dd>
<input type="text" name="name" id="name" size="45" maxlength="100" value="<?=form_set('name','text','name','','1','0',$check_mode)?>" onfocus='this.style.backgroundColor="#000"' onblur='this.style.backgroundColor="#000"' />
</dd>
</dl>
<dl>
<dt><label for="mail">mail:</label></dt>
<dd>
<input type="text" name="mail" id="mail" size="45" maxlength="150" style="ime-mode: disabled;" value="<?=form_set('mail','text','mail','','1','0',$check_mode)?>" onfocus='this.style.backgroundColor="#000"' onblur='this.style.backgroundColor="#000"' />
</dd>
</dl>
<dl>
<dt><label for="mess">message:</label></dt>
<dd>
<textarea name="mess" id="mess" rows="5" cols="45" onfocus='this.style.backgroundColor="#000"' onblur='this.style.backgroundColor="#000"'><?=form_set('message','textarea','mess','','1','0',$check_mode)?></textarea>
</dd>
</dl> [/sourcecode]