Botão barra de pesquisa da cor verde

 <form action="/search">

<input name="cx" type="hidden" />
<input name="ie" type="hidden" />
<input name="q" onblur="if(this.value==''){this.value='Digite sua busca aqui'}" onfocus="if(this.value=='Digite sua busca aqui')this.value=''; "value="Digite sua busca aqui" size="28"/>
<input type="image" src="http://ra606a.blu.livefilestore.com/y1puZOyb7_6YKWR3s7ODnkSP0k0H8-vfexl0-9rHkE-5CVvWFDMpIVhHYfdLA4zjVYh2ZQNZR-nmrI/bot_9.gif" /></form>