/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
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
}

function ValidateForm(numDaystoAdd){
 var dt=document.frmCalcDate.txtDate;
 //alert(dt.value);
 if (isDate(dt.value)==false){
  dt.focus()
  return false
 }
    //alert(dt.value);
    var vDate = new Date(dt.value);
    //var vDate2 = new Date(dt.value);

    vDate.setDate(vDate.getDate()+ parseInt(numDaystoAdd));

    //alert(vDate.getDate());
    //alert(vDate.getMonth()+1+"/"+vDate.getDate()+"/"+vDate.getFullYear());
    document.frmCalcDate.txtReturnDate.value = vDate.getMonth()+1+"/"+vDate.getDate()+"/"+vDate.getFullYear();


    return true;
 }

function checkEnter(e){ 
var characterCode; 

if(e && e.which){ 
e = e;
characterCode = e.which; 
}
else{
e = event;
characterCode = e.keyCode; 
}

if(characterCode == 13){ 
document.forms[1].submit(); 
return false; 
}
else{
return true; 
}

}