<SCRIPT language=javascript >
<!--
function inputkey(key)
{
if(document.ddd.shuzi.value == null){
document.ddd.shuzi.value = key}
else{
document.ddd.shuzi.value += key
}
}
//退格
function backspace()
{
if(document.ddd.shuzi.value.length>1)
document.ddd.shuzi.value=document.ddd.shuzi.value.substring(0,document.ddd.shuzi.value.length - 1)
else
document.ddd.shuzi.value=''
}
//-->
</script>
<body onload="JavaScript:document.ddd.shuzi.focus();">
<br>
<form method="POST" name=ddd>
<table width=100% border=0>
<td width="305">
<table border=0 width="100%">
<tr>
<td>请您输入学号：<input type=text name="shuzi" onmouseover="document.ddd.shuzi.focus();" size=20>
</td>
</tr>
</table>
</td>
<td valign="middle">
<input type="button" value=" 1 " name=k1 onmousedown="inputkey('1')">
<input type="button" value=" 2 " name=k2 onmousedown="inputkey('2')">
<input type="button" value=" 3 " name=k3 onmousedown="inputkey('3')">
<input type="button" value=" 4 " name=k4 onmousedown="inputkey('4')">
<input type="button" value=" 5 " name=k5 onmousedown="inputkey('5')">
<input type="button" value=" 清屏 " onmousedown="document.ddd.shuzi.value = '' ;"><br>
<input type="button" value=" 6 " name=k6 onmousedown="inputkey('6')">
<input type="button" value=" 7 " name=k7 onmousedown="inputkey('7')">
<input type="button" value=" 8 " name=k8 onmousedown="inputkey('8')">
<input type="button" value=" 9 " name=k9 onmousedown="inputkey('9')">
<input type="button" value=" 0 " name=k0 onmousedown="inputkey('0')">
<input type="button" value=" 退格 " onmousedown="backspace()">
</td>
</tr>
</table>
</form>