// 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 strDay=dtStr.substring(0,pos1);
        //var strMonth=dtStr.substring(pos1+1,pos2);
        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){
                return false;
        }
        if (strMonth.length<1 || month<1 || month>12){
                return false;
        }
        if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
                return false;
        }
        if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
                return false;
        }
        if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
                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){
                   return false;
                }
                if ( str.indexOf(at)+1==lstr){
                   return false;
                }
                if (str.indexOf(at)==0){
                   return false;
                }
                if (str.indexOf(dot)==-1){
                    return false;
                }
                if (str.indexOf(dot)==0){
                    return false;
                 }
                if (str.indexOf(dot)+1==lstr){
                   return false
                 }
                 if (str.indexOf(at,(lat+1))!=-1){
                    return false;
                 }

                 if (str.substring(lat-1,lat)==dot){
                    return false;
                 }
                 if (str.substring(lat+1,lat+2)==dot){
                    return false;
                 }
                 if (str.indexOf(dot,(lat+2))==-1){
                    return false;
                 }

                 if (str.indexOf(" ")!=-1){
                    return false;
                 }

                 return true;
}

function check()
{
	var FORM = document.reg_form
	var mem_type = FORM.member_type.value

          if (FORM.userid.value == '')
              {
               alert("Please enter User ID.");
	       FORM.userid.focus();
              }
           else if((mem_type == 'new_member')&&(FORM.password.value == ''))
              {
               alert("Please enter Password.")
               FORM.password.focus();
              }
           else if((mem_type == 'new_member')&&((FORM.confirm.value == '')||(FORM.confirm.value != FORM.password.value)))
              {
               alert(" Password and Confirm Password doesn't match.")
               FORM.confirm.focus();
              }
           else if(FORM.last_name.value == '')
              {
               alert("Please enter Last name today.")
               FORM.last_name.focus();
              }
           else if(FORM.first_name.value == '')
              {
               alert("Please enter First name today.")
               FORM.first_name.focus();
              }
           else if(FORM.last_name_nis.value == '')
              {
               alert("Please enter Last name used at NIS.")
               FORM.last_name.focus();
              }
           else if(FORM.first_name_nis.value == '')
              {
               alert("Please enter First name used at NIS.")
               FORM.first_name.focus();
              }
           else if ((FORM.birth_date.value == '') || (isDate(FORM.birth_date.value)==false))
	      {
	        alert('Please enter valid Date of Birth');
		FORM.birth_date.focus();
	      }
           else if(FORM.category.value == '')
              {
               alert("Please Select Category.")
               FORM.category.focus();
              }
           else if(FORM.class_value.value == '')
              {
               alert("Please select class of.")
               FORM.class_value.focus();
              }
           else if((FORM.email.value == '')|| !(echeck(FORM.email.value)))
              {
               alert("Please enter Valid Email id.")
               FORM.email.focus();
              }
           else if(FORM.address.value == '')
              {
               alert("Please enter Postal Address.")
               FORM.address.focus();
              }
	   else
		{
		FORM.submit()
		}
}

function showClassYear()
{
	select_val = document.reg_form.category.value
        cl_div_object = window.document.getElementById('class_div')
        yr_div_object = window.document.getElementById('year_div')
        yr_div_object_style = yr_div_object.style.display
        cl_div_object_style = cl_div_object.style.display
        cl_div_val_object = window.document.getElementById('class_div_val')
        yr_div_val_object = window.document.getElementById('year_div_val')
        yr_div_val_object_style = yr_div_val_object.style.display
        cl_div_val_object_style = cl_div_val_object.style.display

        if (select_val == 'FormerStudent')
        {
                yr_div_object.style.display="none";
                cl_div_object.style.display="inline";
                yr_div_val_object.style.display="none";
                cl_div_val_object.style.display="inline";
        }
        else if (select_val == 'FormerStaff')
        {
                cl_div_object.style.display="none";
                yr_div_object.style.display="inline";
                cl_div_val_object.style.display="none";
                yr_div_val_object.style.display="inline";
        }
        else
        {
                cl_div_object.style.display="none";
                yr_div_object.style.display="none";
                cl_div_val_object.style.display="none";
                yr_div_val_object.style.display="none";
        }
}

function doCancel()
 {
   var FORM =  document.reg_form
   var portal_url = FORM.portal_url.value
   FORM.action= portal_url
   FORM.submit()
 }

function userCreated()
 {
   alert('Your profile has been created successfully, you will be receiving confirmation mail soon.')
 }