submit按钮的背景阴影怎么去掉

submit按钮的背景阴影如何去掉？

css 控制submit加载背景图片做提交按钮

<style   type="text/css">   
<!--   
   .button1{font-size:12px;cursor:hand;width:   58px;height:   21px;background-color:   #ffffff;background-image:   url(images/baby/denglu_button.jpg);background-repeat:   repeat;background-attachment:   scroll;background-position:   center;border:   0   solid   #000000;text-align:   center;padding-top:   3px;}   
-->   
</style>  

<form>

<input class="button1" type="submit" name="loginsubmit" value=" "/>

</form>