求高手解答一个按钮效果的样式写法
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------解决方案-------------------- <!DOCTYPE HTML PUBLIC  "-//W3C//DTD HTML 4.0 Transitional//EN ">  
  <HTML>  
   <HEAD>  
    <TITLE>  New Document  </TITLE>  
    <META NAME= "Generator " CONTENT= "EditPlus ">  
    <META NAME= "Author " CONTENT= " ">  
    <META NAME= "Keywords " CONTENT= " ">  
    <META NAME= "Description " CONTENT= " ">    
    <LINK href= "http://mail.126.com/style_2007_ch2_0525.css " type=text/css rel=stylesheet>  
   </HEAD>    
   <BODY>    
    <INPUT class=inp_L1 id=input_btn1 onmouseover= "this.className= 'inp_L2 ' " tabIndex=4 onmouseout= "this.className= 'inp_L1 ' " type=submit value= "登 录 ">   
   </BODY>  
  </HTML>