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function checkIP2(sIPAddress)
{
    var exp=/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;

    var reg = sIPAddress.match(exp);
    var ErrMsg="ÄãÊäÈëµÄÊÇÒ»¸ö·Ç·¨µÄIPµØÖ·¶Î£¡\nIP¶ÎΪ£º:xxx.xxx.xxx.xxx£¨xxxΪ0-255)£¡"   
    var Msg="ÄãÊäÈëµÄÊÇÒ»¸öºÏ·¨µÄIPµØÖ·¶Î£¡"   
    if(reg==null)
    {
        alert(ErrMsg);
    }
    else
    {
        alert(reg);
    }