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 validate_volunteer()
{
    valid = true;
	var dt=document.Volunteer
	var strEmail = dt.Email.value;
	var strZipCode = dt.ZipCode.value;
	var strHomePhone = dt.HomePhone.value;
	var strCellPhone = dt.CellPhone.value;

	var strEmailRegExp = /^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.(([0-9]{1,3})|([a-zA-Z]{2,3})|(aero|coop|info|museum|name))$/;
	var strPhoneRegExp = /^(?:\([2-9]\d{2}\)?|[2-9]\d{2}(?:\-?|\ ?))[- \.]?[2-9]\d{2}[- \.]?\d{4}(\s(x\d+)?){0,1}$/;
	var strZipCodeRegExp = /^\d{5}-\d{4}|\d{5}$/;


	if  (dt.FirstName.value == "") {
		alert ("Please enter your first name.");
    	dt.FirstName.focus()
    	valid = false;
    	
	} else if (dt.LastName.value == "") {
		alert ("Please enter your last name.");
    	dt.LastName.focus()
    	valid = false;
    	
 	} else if (dt.StreetAddress.value == "") {
		alert ("Please enter your street address.");
    	dt.StreetAddress.focus()
    	valid = false;
    	
   } else if (dt.City.value == "") {
		alert ("Please enter your city.");
    	dt.City.focus()
    	valid = false;
    	
   } else if (dt.State.value == "") {
		alert ("Please enter your state.");
    	dt.State.focus()
    	valid = false;
    	
    } else if (isInteger(dt.ZipCode.value) == false) {
		alert ("Please enter a valid zip code without dashes.");
    	dt.ZipCode.focus()
    	valid = false;
    	
 	} else if (dt.ZipCode.value == "") {
		alert ("Please enter a valid zip code without dashes.");
    	dt.ZipCode.focus()
    	valid = false;
    	
	 } else if (isInteger(dt.HomePhone.value) == false) {
		alert ("Please enter a valid home phone number without parenthesis and dashes.");
    	dt.HomePhone.focus()
    	valid = false;
    	
 	} else if (dt.HomePhone.value == "") {
		alert ("Please enter a valid home phone number without parenthesis and dashes.");
    	dt.HomePhone.focus()
    	valid = false;
    	
   } else if (isInteger(dt.CellPhone.value) == false) {
		alert ("Please enter a valid cell phone number without parenthesis and dashes.");
    	dt.CellPhone.focus()
    	valid = false;
    	
 		
	// validate the user's email address
	} else if (!dt.Email.value.match(strEmailRegExp)) {
			alert("Please enter valid email address.")
			dt.Email.focus()
			valid = false;
			
	} else if (dt.HoursMonth.value == "") {
		alert ("Please enter the hours per month you would like to volunteer.");
    	dt.HoursMonth.focus()
    	valid = false;


	 } else if (isInteger(dt.HoursMonth.value) == false) {
		alert ("Please enter the hours per month you would like to volunteer.");
    	dt.HoursMonth.focus()
    	valid = false;
    	
     } else if (dt.AgencyId.selectedIndex == 0) {
		alert ("Please select a agency before continuing.");
		dt.AgencyId.focus()
        valid = false;	
	
    	
}

return valid;
}

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