// 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 emailvalidate(email) {
	rexp = /(\w+)+(\.)*(\w+)*(\.)*\w*@(\w+\.)+[A-Za-z]+(\.)*[A-Za-z]/;
	result = email.search(rexp);
	//alert(result);
	return result
	}
function formvalidate() { 
		
		
		// validates first name contains chars
		if (document.preapp.FirstName.value == ""){
			alert ("Please enter your First Name");
			return false;
		}
		// validates last name contains chars
		if (document.preapp.Name.value == ""){
			alert ("Please enter your Last Name");
			return false;
		}
		// validates street1 info
		if (document.preapp.Street1.value == ""){
			alert ("Please enter your Street Address");
			return false;
		}
		// validates city
		if (document.preapp.City.value == ""){
			alert ("Please enter your City");
			return false;
		}
		// validates state
		if (this.document.preapp.StateID.options[ this.document.preapp.StateID.selectedIndex].value == 0) {
			alert ("Please choose your State");
			return false;
		}
		// validates postal code
		if (document.preapp.PostalCode.value == ""){
			alert ("Please enter your ZIP Code");
			return false;
		}
		// validates daytimephone
		if (document.preapp.Phone.value == ""){
			alert ("Please enter your Phone Number ");
			return false;
		}
		// validates country
		//if (document.preapp.CountryID.options[ this.document.preapp.CountryID.selectedIndex].value == 0){
			//alert ("Please choose a Country from the list");
			//return false;
		//}
	
		// validates email
		if (document.preapp.Email.value == ""){
			alert ("Please enter your Email Address");
			return false;
		}	
		//validate email address is correct
		//if (emailvalidate(document.preapp.Email.value) == -1 ) {
		  //	alert ("Please Enter a Valid Email Address");
			//return false;
		//}
		
		// validates confirmemail field
		if (document.preapp.confirmemail.value == ""){
			alert ("Please Enter a Confirmation Email Address");
			return false;
		}	
		// validates that email and confirmemail are identical
		if (document.preapp.Email.value != document.preapp.confirmemail.value){
			alert ("Make sure the Emails you entered are matching");
			return false;
		}	
		// validates dob
		if (document.preapp.whenBorn.value == "")
		{
			alert("Please enter your Date of Birth");
			return false;
		} else {
				var dt=document.preapp.whenBorn
				if (isDate(dt.value)==false){
				dt.focus()
				return false
				}
			}
		/*if (document.preapp.GPA.value == ""){
			alert ("Please enter your GPA");
			return false;
		}*/
		// validates Interest Level
		/*if (document.preapp.InterestLevel.value == '-'){
			alert ("Please tell us your level of interest in studying abroad");
			return false;
		}
		// validates howdidyouhear  list or value for other howdiduhear type
		if (document.preapp.HowDidUHearOther.value=="") {
		if (document.preapp.HowDiduHearSetID1.checked == false &
			document.preapp.HowDiduHearSetID2.checked == false &
			document.preapp.HowDiduHearSetID3.checked == false &
			document.preapp.HowDiduHearSetID4.checked == false &
			document.preapp.HowDiduHearSetID5.checked == false &
			document.preapp.HowDiduHearSetID6.checked == false &
			document.preapp.HowDiduHearSetID7.checked == false &
			document.preapp.HowDiduHearSetID8.checked == false &
			document.preapp.HowDiduHearSetID9.checked == false) {
			alert ("Please tell us how did you hear about AYUSA");
			return false;
		}
		}*/
		
		if (
			document.preapp.CountrySetID1.checked == false &&
			document.preapp.CountrySetID3.checked == false &&
			document.preapp.CountrySetID4.checked == false &&
			document.preapp.CountrySetID5.checked == false &&
			document.preapp.CountrySetID6.checked == false &&
			document.preapp.CountrySetID7.checked == false &&
			document.preapp.CountrySetID8.checked == false &&
			document.preapp.CountrySetID10.checked == false &&
			document.preapp.CountrySetID13.checked == false &&
			document.preapp.CountrySetID14.checked == false &&
			document.preapp.CountrySetID16.checked == false &&
			document.preapp.CountrySetID24.checked == false ) {
			alert ("Please choose a country from the list");
			return false;
		} 
		if (document.preapp.ProgramAY.checked == false &
			document.preapp.ProgramFallSemester.checked == false &
			document.preapp.ProgramSummer.checked == false) {
			alert ("How long would you like to study");
			return false;
		}
		// validates program year
		if (document.preapp.whenDepartureYear.value == '-'){
			alert ("When do you plan to study abroad?");
			return false;
		}
		// validates how did you hear
		if (document.preapp.howdidyouhear.value == '-'){
			alert ("How did you hear about Intrax Study Abroad?");
			return false;
		}
		return true;
				
}	
function showHide(obj)
{
var el = document.getElementById(obj);
	if(el.style.display != "block")
	{
	el.style.display = "block";
	}
	else
	{
	el.style.display = "none";
	}
}