select里实现checkbox选择和input里边实现上下一条

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>select里实现checkbox选择和input里边实现上下一条</title>
<style type="text/css">
img {border-width: 0px 0px 0px 0px}
select{width:100px;}
.input_left{
float:left;
margin-top:2px;
}
.input_centor{
float:left;
}
.input_right{
float:left;
margin-top:2px;
}
</style>
<script language="javascript">
var n=0;
var info=new Array("2012083100001","2012083100002","2012083100003","2012083100004","2012083100005","2012083100006","2012083100007","2012083100008","2012083100009","2012083100010","2012083100011");
function preUp(){
if(n>0){
n=n-1;
document.getElementById("show").value=info[n];
}
else{
alert("已经是第一条了");
}}
function nextDown(){
if(n<info.length-1){
n=n+1;
document.getElementById("showId").value=info[n];
}
else{
alert("已经是最后一条了");
}
}
document.getElementById("showId").value=info[0];
</script>
</head>
<body>

    <div style="text-align:center">
            <div class="input_left">

            <div class="input_centor"><input name="input" id="showId" type="text" value="2012083100005" /></div>
            <div class="input_right"> </div>
     </div>
     </td>
  </tr>
</table>
</div>


<input type="button" value='<<' onclick="preUp()">
<input type="textbox" id="showId" value='' size=40><input name="input" id="showId" type="text" value="2012083100005" />
<input type="button" value='>>' onclick="nextDown()">
<input name="" type="checkbox" value="" />
</body>
</html>

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