<style type="text/css"> <!-- .over {color:yellow; background: navy} .down {color:yellow; background: navy; font-style: italic} --> </style> <input type="Button" onMouseOver="this.className='over';" onMouseOut="this.className='';" onMouseDown="this.className='down';" onMouseUp="this.className='over';" value="按钮也疯狂" onClick="this.value='我真的好喜欢你！'" name="Button">