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

function funCheckForm()
{
	if (checkString(document.frmCalendarRequest.Event_Name,"'Event Name'", false) == false) return false;
	if (checkString(document.frmCalendarRequest.Event_Location,"'Event Location'", false) == false) return false;
	if (IsDateValid(document.frmCalendarRequest.Start_Date, 'Start Date') == false) return false;
	if (IsDateValid(document.frmCalendarRequest.End_Date, 'End Date') == false) return false;	
	if (isTimeValid(document.frmCalendarRequest.Start_Time.value) == false)
	{
		alert("You did not enter a valid time in the 'Start Time'. This is required.");
		document.frmCalendarRequest.Start_Time.focus();
		return false;
	}
	if (isTimeValid(document.frmCalendarRequest.End_Time.value) == false)
	{
		alert("You did not enter a valid time in the 'End Time'. This is required.");
		document.frmCalendarRequest.End_Time.focus();
		return false;
	}
	if (checkString(document.frmCalendarRequest.Event_Description,"'Description'", false) == false) return false;
	return true;
}

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)
		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 IsDateValid(strDate, strField)
{
	if (isDate(strDate.value)==false)
	{
		alert("You did not enter a valid date in the '" + strField + "'. Please re-enter it now.");
		strDate.focus();
		return false;
	}
    return true;
}

function isTimeValid(value)
{
	var colonCount = 0;
	var hasMeridian = false;
    for (var i=0; i<value.length; i++)
    {
    	var ch = value.substring(i, i+1);
	    if ( (ch < '0') || (ch > '9') )
		{
        	if ( (ch != ':') && (ch != ' ') && (ch != 'a') && (ch != 'A') && (ch != 'p') && (ch != 'P') && (ch != 'm') && (ch != 'M'))
			{
            	return false;
         	}
		}
      	if (ch == ':')
		{
			colonCount++;
		}
      	if ( (ch == 'p') || (ch == 'P') || (ch == 'a') || (ch == 'A') )
		{
			hasMeridian = true;
		}
    }
    if ( (colonCount < 1) || (colonCount > 2) )
    {
	   	return false;
	}
    var hh = value.substring(0, value.indexOf(":"));
    if ( (parseFloat(hh) < 0) || (parseFloat(hh) > 23) )
	{
		return false; 
	}
    if (hasMeridian)
	{
    	if ( (parseFloat(hh) < 1) || (parseFloat(hh) > 12) )
		{
			return false;
		}
	}
	if (colonCount == 2)
	{
    	var mm = value.substring(value.indexOf(":")+1, value.lastIndexOf(":"));
   	}
	else
	{
    	var mm = value.substring(value.indexOf(":")+1, value.length);
    }
    if ( (parseFloat(mm) < 0) || (parseFloat(mm) > 59) )
	{
		return false;
	}
    if (colonCount == 2)
	{
    	var ss = value.substring(value.lastIndexOf(":")+1, value.length);
	}
	else
	{
    	var ss = "00";
	}
    if ( (parseFloat(ss) < 0) || (parseFloat(ss) > 59) )
	{
		return false;
	}
    return true;
}


function funCheckForMessageFlag()
{
	var loc = document.location.href;
	var strMessFlag =loc.substring(loc.indexOf("EmailSent=")+10);
	switch (strMessFlag)
	{	
		case 'yes':
			document.writeln	("<p><FONT color=#FF0000>Your request has been sent to Volunteer Services. Thank you for your submission.</FONT></p>");
			return;
		default:
			return;
	}
}