function checkIP(ip){
var re = /^((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))$/;
if(re.test(ip))
return true;
else
return false;
}
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