var dateSeparator = "/";
  var minYear = 1900;
  var maxYear = 2100;

  function isInteger(s)
  {
  	var i;
    for (i = 0; i < s.length; i++)
    {
      var c = s.charAt(i);
      if ((c < "0") || (c > "9"))
      {
        return false;
      }
    }
    return true;
  }

  function stripCharsInBag(s, bag)
  {
	  var i;
    var 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)
  {
    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(dateSeparator);
  	var pos2=dtStr.indexOf(dateSeparator,pos1+1);
  	var strDay=dtStr.substring(0,pos1);
  	var strMonth=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("Please enter the date in the format: DD/MM/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(dateSeparator,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dateSeparator))==false)
    {
  		alert("Please enter a valid date");
  		return false;
    }
    return true;
  }


  function echeck(str) 
  {
		var at="@";
		var dot=".";
		var lat=str.indexOf(at);
		var lstr=str.length;
		var ldot=str.indexOf(dot);
		if (str.indexOf(at) == -1)
    {
		  alert("Please enter a valid email address");
		  return false;
		}

		if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr)
    {
		  alert("Please enter a valid email address");
		  return false;
		}
		if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr)
    {
		  alert("Please enter a valid email address");
		  return false;
		}
    if (str.indexOf(at,(lat+1)) != -1)
    {
		  alert("Please enter a valid email address");
		  return false;
		}
		if (str.substring(lat-1,lat) == dot || str.substring(lat+1,lat+2) == dot)
    {
		  alert("Please enter a valid email address");
      return false;
    }
    if (str.indexOf(dot,(lat+2)) == -1)
    {
		  alert("Please enter a valid email address");
		  return false;
    }
		if (str.indexOf(" ") != -1)
    {
		  alert("Please enter a valid email address");
		  return false;
    }
    return true;
  }



  var digits = "0123456789";
  var phoneNumberDelimiters = "()- ";
  var validWorldPhoneChars = phoneNumberDelimiters + "+";
  var minDigitsInIPhoneNumber = 10;


  function checkInternationalPhone(strPhone)
  {
    s = stripCharsInBag(strPhone,validWorldPhoneChars);
    return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
  }