/********************************************/
//	HighLightField
/********************************************/
function HighLightField(field, highlight)
{
	field.style.borderColor = (highlight) ? 'red': '';
}

/********************************************/
//	HighLightField
/********************************************/
function GetComboValue(ctrl)
{
	try
	{
		return ctrl.options[ctrl.selectedIndex].value;
	}
	catch (ex)
	{
		return '';
	}
}
    


// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

/********************************************/
//	isInteger
/********************************************/
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;
}


/********************************************/
//	stripCharsInBag
/********************************************/
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;
}

/********************************************/
//	daysInFebruary
/********************************************/
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 );
}

/********************************************/
//	DaysArray
/********************************************/
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
}

/********************************************/
//	isDate
/********************************************/
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)
  {
    return false;
  }
  
  if (strMonth.length<1 || month<1 || month>12)
  {
    return false;
  }
  
  if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month])
  {
    return false;
  }
  
  if (strYear.length != 4 || year==0 || year<minYear || year>maxYear)
  {
    return false;
  }
  
  if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false)
  {
    return false;
  }
  
  return true;
}