javascript图片型按钮

<style>.button {
font: 12px Tahoma, Verdana;
padding: 0 5px;
color: #D3E0E7;
background-image: url("/article/upimages3/200707251809550[1].gif");
background-repeat: repeat-x;
background-position: 0 50%;
outline: 1px solid #D3E0E7;
border: 1px solid #FFF !important;
height: 19px !important;
border: 1px solid #D3E0E7;
height: 21px;
line-height: 17px;
}
</style>
<form><input class="button" type="submit" name="rulesubmit" value="同 意" style="height: 23px">
<input class="button" type="button" name="return" value="不同意" style="height: 23px"></form>