function isNum(num,low,hi) {
            if(isNaN(num)||num<low||num>hi)return false;
            return true;
            }
            function isValidIP(v) {
            nums=v.split(".");
            if(nums.length!=4)return false;
            for(j=0;j<4;j++){
            if(!isNum(nums[j],0,255))return false;
            }
            return true;
            }
            function checkIP(Object,Desc,MaybeEmpty)
            {
            var strValue= Object.value;
            if(MaybeEmpty){
            if(strValue.length ==0){
            return true;
            }
            }
            if(isValidIP(strValue)==false)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            return true;
            }
            function checkPort(Object,Desc,lowest,MaybeEmpty)
            {
            var pattern=/^\d{4,5}$/;
            var strValue= Object.value;
            if(MaybeEmpty){
            if(strValue.length ==0){
            return true;
            }
            }
            if(strValue.match(pattern) == null)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            if (strValue<lowest || strValue >65535)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            return true;
            }
            function checkFitLongStr(Object,Desc,MaybeEmpty)
            {
            var pattern=/^\S{0,25}$/;
            var strValue= Object.value;
            if(MaybeEmpty){
            if(strValue.length ==0){
            return true;
            }
            }
            if(strValue.match(pattern) == null)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            return true;
            }
            function checkFitLongNum(Object,Desc,MaybeEmpty)
            {
            var pattern=/^\d{0,8}$/;
            var strValue= Object.value;
            if(MaybeEmpty){
            if(strValue.length ==0){
            return true;
            }
            }
            if(strValue.match(pattern) == null)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            return true;
            }
            function checkGC(Object,Desc)
            {
            var pattern = /^\-{0,1}\d{1,2}$/
            var strValue = Object.value;
            if (strValue.length ==0){
            return true;
            }
            if(strValue.match(pattern) == null)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            if (strValue < -12 ||strValue > 18)
            {
            alert(Desc + " Format Error!");
            Object.focus();
            return false;
            }
            return true;
            }