js实现按钮加背景图片常用方法

<input type="submit" onMouseOver="style=background:url('imgs/jb51.gif')"/>

<input type="button" value="提交" style="background:url(图片地址) no-repeat;border:none;text-indent:-2000px;width:100px;height:30px;">

<input name="submit" type="image" value=" " src="jb51.jpg" />