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



// CHECK FOR VALID EMAIL ADDRESS
function check_email(e) {
ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";

for(i=0; i < e.length ;i++){
if(ok.indexOf(e.charAt(i))<0){ 
return (false);
}	
} 

if (document.images) {
re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;
if (!e.match(re) && e.match(re_two)) {
return (-1);		
 } 
}

}



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.      ")
		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 ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }


function validate(){
	f = document.appForm;
	if(f.fname.value==""){
		alert("Please enter your full name or alias.       ");
		f.fname.focus();
		return false;
	}
	
	if(f.birthdate.value==""){
		alert("Please enter your birthdate.         ");
		f.birthdate.focus();
		return false;
	}
	
	var dt = f.birthdate;
	if(isDate(dt.value)==false){
			dt.focus();
			return false;
	}
	
	
	if(f.email.value==""){
			alert("Please enter a valid email address.         ");
			f.email.focus();
			return false;
	}
	
	if(f.email.value != ""){   
		// check the first email address ( the exclamation means "not" )
		if(!check_email(f.email.value)){
		alert("Please enter a valid email address.    ");
		f.email.focus();
		return false;
		}
	}
		
	
	var opt = 0;
	for(counter=0;counter<f.interested_in.length;counter++){
			if(f.interested_in[counter].checked){
				opt = opt + 1;
			}				
	}
	
	if(opt<1){
			alert("Please tell us which forms of modeling would you be interested in.       ");
			return false;
	}
	
	
}


function clearInputBox(elem) {
  		if (elem.defaultValue  ==elem.value) {
			elem.value = "";
		}
	}

	function restoreInputBox(elem) {
  		if (elem.value == "") {
			elem.value = elem.defaultValue;
		}
	}	
	
	
function validSubscriber() {
		f = document.subscriberForm;
		if(f.emailaddr.value==""){
				alert("Please enter your email address.            ");
				f.emailaddr.focus();
				return false;				
		}
		if(f.emailaddr.value != ""){   
			// check the first email address ( the exclamation means "not" )
			if(!check_email(f.emailaddr.value)){
			alert("Please enter a valid email address.    ");
			f.emailaddr.focus();
			return false;
			}
		}
		
}