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


function popUp(URL) {
  window.open(URL, 'viewpicture', 'toolbar=0,scrollbars=0,location=0,statusbar=1,menubar=0,resizable=1,width=600,height=600,left = 287,top = 159');
}

function isEmail(sVal) {
  var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
  if (filter.test(sVal))
    return true;
  else{
    return false;
  }
}

function isEmptyField(sVal) {
  if (sVal == '') {
    return true;
  } else {
    return false;
  }
}


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 getDate(sFormName, sDayField, sMonthField, sYearField) {
   var dayValue = document.forms[sFormName].elements[sDayField].value;
   var monthValue = document.forms[sFormName].elements[sMonthField][document.forms[sFormName].elements[sMonthField].selectedIndex].value;
   var yearValue = document.forms[sFormName].elements[sYearField][document.forms[sFormName].elements[sYearField].selectedIndex].value;
   var sUrl = '/includes/calendar.asp?sDayField=' + sDayField + '&sMonthField=' + sMonthField + '&sYearField=' + sYearField + '&sFormName=' + sFormName + '&sDayValue=' + dayValue +'&sMonthValue=' + monthValue + '&sYearValue=' + yearValue
   window.open(sUrl,'calendar','toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=200,height=180,left = 412,top = 307.5');
 }

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
}