<style>
input{width:30;border:0;text-align:center}
</style>
<SCRIPT language=JavaScript>
<!--
function mask(obj){
obj.value=obj.value.replace(/[^\d]/g,'')
key1=event.keyCode
if (key1==37 || key1==39)
{
nextip=parseInt(obj.name.substr(2,1))
nextip=key1==37?nextip-1:nextip+1;
nextip=nextip>=5?1:nextip
nextip=nextip<=0?4:nextip
eval("ip"+nextip+".focus()")
}
if(obj.value.length>=3)
if(parseInt(obj.value)>=256 || parseInt(obj.value)<=0)
{
alert(parseInt(obj.value)+"IP地址错误！")
obj.value=""
obj.focus()
return false;
}
else
{
nextip=parseInt(obj.name.substr(2,1))+1
nextip=nextip>=5?1:nextip
nextip=nextip<=0?4:nextip
eval("ip"+nextip+".focus()")
}
}
//-->
</script>
<body>IP地址输入
<div style="border-width:1;border-color:balck;border-style:solid;width:165;font-size:9pt">
<input type=text name=ip1 maxlength=3 onkeyup="mask(this)">.
<input type=text name=ip2 maxlength=3 onkeyup="mask(this)">.
<input type=text name=ip3 maxlength=3 onkeyup="mask(this)">.
<input type=text name=ip4 maxlength=3 onkeyup="mask(this)">
</div>
</body>