function validateField(field_id){
        var validated = false;
        var first_value = document.getElementById(field_id).value;
        if(first_value.length == 0){
//                focusOnElement(field_id);
                validated = false;
        }else{
                validated = true;
        }
        return validated;
}

function validateEmailField(field_id){
    var validated = false;
    var fieldValidated = validateField(field_id);
    if(fieldValidated){
        var validRegExp = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
///^.+@.+\..+$/;
        var strEmail = document.getElementById(field_id).value;
        if (strEmail.search(validRegExp) == -1){
//                    focusOnElement(field_id);
                    validated = false;
        }else{
                    validated = true;
        }
   }
   return validated;
}

function validateEmailField2(field_id){
    var validated = false;
    var fieldValidated = validateField(field_id);
    if(fieldValidated){
        var validRegExp = "/^.+@.+\..+$/";
        var strEmail = document.getElementById(field_id).value;
        if (strEmail.search(validRegExp) == -1){
//                    focusOnElement(field_id);
                    validated = false;
        }else{
                    validated = true;
        }
   }
   return validated;
}

function isIntegerById(id){
    var fieldValidated = validateField(id);
    if(fieldValidated){
                var s = document.getElementById(id).value;
                var i;
            for (i = 0; i < s.length; i++){
                // Check that current character is number.
                var c = s.charAt(i);
                if (((c < "0") || (c > "9"))) return false;
            }
            // All characters are numbers.
            return true;
        }else{
                return false;
        }

}

function IsNumericById(id){
        var fieldValidated = validateField(id);
    if(fieldValidated){

                var sText = document.getElementById(id).value;
            var ValidChars = "0123456789.";
            var IsNumber=true;
            var Char;

            for (i = 0; i < sText.length && IsNumber == true; i++){
              Char = sText.charAt(i);
              if (ValidChars.indexOf(Char) == -1)
                 {
                 IsNumber = false;
                 }
            }
            return IsNumber;
        }else{
                return false
        }
}


function IsNumeric(sText){
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

   for (i = 0; i < sText.length && IsNumber == true; i++)
      {
      Char = sText.charAt(i);
      if (ValidChars.indexOf(Char) == -1)
         {
         IsNumber = false;
         }
      }
   return IsNumber;
}


//Date validation helper scripts
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
        var i;
    for (i = 0; i < s.length; i++){
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}



function stripCharsInBag(s, bag){
        var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
        // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
        for (var i = 1; i <= n; i++) {
                this[i] = 31
                if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
                if (i==2) {this[i] = 29}
   }
   return this
}

function isDate(dtStr){
        var daysInMonth = DaysArray(12)
        var pos1=dtStr.indexOf(dtCh)
        var pos2=dtStr.indexOf(dtCh,pos1+1)
        var strMonth=dtStr.substring(0,pos1)
        var strDay=dtStr.substring(pos1+1,pos2)
        var strYear=dtStr.substring(pos2+1)
        strYr=strYear
        if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
        if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
        for (var i = 1; i <= 3; i++) {
                if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
        }
        month=parseInt(strMonth)
        day=parseInt(strDay)
        year=parseInt(strYr)
        if (pos1==-1 || pos2==-1){
                alert("The date format should be : mm/dd/yyyy")
                return false
        }
        if (strMonth.length<1 || month<1 || month>12){
                alert("Please enter a valid month")
                return false
        }
        if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
                alert("Please enter a valid day")
                return false
        }
        if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
                alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
                return false
        }
        if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
                alert("Please enter a valid date")
                return false
        }
return true
}
//END - Date validation helper scripts

function focusOnElement(element_id){
        document.getElementById(element_id).focus();
}

function showHideTag(field_id, show){
        if(show){
                document.getElementById(field_id).style.display = "";
        }else{
                document.getElementById(field_id).style.display = "none";
        }
}