input스타일 roll & over배경 넣기

질문 참조 : http://sir.co.kr/bbs/board.php?bo_table=pg_qa&wr_id=1354

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>over image on input stly</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
body{
font-size:63%;
color:#000;
}
/*input*/
.input_on{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #999;
background:url(http://www.google.com/images/nav_logo36.png) no-repeat;
}
.input_off{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #CCC;
background-color:#FFF;
}
.input_move{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #999;
background:url(http://www.google.com/images/nav_logo36.png) no-repeat;
}
.input_out{
/*height:16px;기본높이*/
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #CCC;
background-color:#FFF;
}
/*form*/
ul.input_test{
margin:20px auto 0 auto;
width:500px;
list-style-type:none;
}
ul.input_test li{
width:500px;
height:22px;
margin-bottom:10px;
}
.input_test label{
float:left;
padding-right:10px;
width:100px;
line-height:22px;
text-align:right;
font-size:1.4em;
}
.input_test p{
float:left;
_margin-top:-1px;
}
.input_test span{
float:left;
padding-left:10px;
line-height:22px;
text-align:left;
font-size:1.2em;
color:#999;
}
</style>
</head>
<body>
<ul class="input_test">
<li>
<label for="inp_name">이름：</label>
<p><input id="inp_name" class="input_out" name="" type="text" onfocus="this.className='input_on';this.onmouseout=''" onblur="this.className='input_off';this.onmouseout=function(){this.className='input_out'};" onmousemove="this.className='input_move'" onmouseout="this.className='input_out'" /></p>
<span>ex) 홍 길 똥?</span>
</li>
<li>
<label for="inp_email">Email：</label>
<p><input id="inp_email" class="input_out" name="" type="text" onfocus="this.className='input_on';this.onmouseout=''" onblur="this.className='input_off';this.onmouseout=function(){this.className='input_out'};" onmousemove="this.className='input_move'" onmouseout="this.className='input_out'" /></p>
<span>ex) [email protected]</span>
</li>
<li>
<label for="inp_web">home：</label>
<p><input id="inp_web" class="input_out" name="" type="text" onfocus="this.className='input_on';this.onmouseout=''" onblur="this.className='input_off';this.onmouseout=function(){this.className='input_out'};" onmousemove="this.className='input_move'" onmouseout="this.className='input_out'" /></p>
<span>ex) test.com</span>
</li>
</ul>

</body>
</html>