Прозрачная форма поиска

.form_s {background:url(/img/37621672.png);height:31px;width:199px;}
.queryField {margin:8px 0px 0px 6px;width:170px;color:#fff;font-size:10px;background:none;border:none;float:left;}
.k_serch {background:url(/img/47609093.png);border:none;margin:9px 3px 0px 0px;width:13px;height:13px;float:right;}
.k_serch:hover {opacity:0.9;}

<form onsubmit="document.getElementById('sfSbm').disabled=true" method="get" action="/search/" class="form_s">
<input type="submit" class="k_serch" id="sfSbm" value=""/>
<input type="text" name="q" value="Поиск" onfocus="if(this.value=='Поиск')this.value=''" onblur="if(this.value=='')this.value='Поиск'" class="queryField"/>
</form>