// ====================================================================
// 
function clean_catholicResult()
{
	document.catholic_form.catholic_result.value=0;
}

function clean_orthodoxResult()
{
	document.orthodox_form.orthodox_result.value=0;
}


// ====================================================================
// 
function trim(s)
{
  return rtrim(ltrim(s));
}

// ====================================================================
// 
function ltrim(s)
{
  return s.replace(/^\s+/, ''); 
}

// ====================================================================
// 
function rtrim(s)
{
  return s.replace(/\s+$/, ''); 
}

// ====================================================================
// 
function catholicEaster(_year)
{ 
	clean_catholicResult(); 
	Easter_month = 0;
	Easter_day   = 0;
	_year = trim(_year); 
	
	if ( _year == "" )
	{
 		alert("Year must be an integer."); 
 		document.catholic_form.catholic_year.focus(); 
 		document.catholic_form.catholic_year.select(); 
 		return false;
	}
	else
	{
		intYear  = parseInt(_year); 
		if ( !(intYear >= 0) )
		{
			alert("Year must be a positive integer."); 
			document.catholic_form.catholic_year.focus(); 
			document.catholic_form.catholic_year.select(); 
			return false;
		}
		
		A = intYear%19 + 1;
		tmp = Math.floor( intYear/100);
		B = tmp + 1;

		tmp = Math.floor( (3*B)/4);
		C = tmp - 12;
		
		tmp = Math.floor( (8*B + 5)/25);
		D =  tmp - 5;

		tmp = Math.floor( (intYear * 5)/4);
		E = tmp - 10 - C;

		F = ( (11*A + 20 + D - C)%30 + 30)%30;
		if ( F == 24 || (F == 25 && A > 11) ) 
			F = F + 1;

		G = 44 - F;
		if ( G < 21 )
			G = G + 30;

		N = G + 7 - ( (E + G) % 7 );
		 
		if ( N > 31 )
		{
			Easter_month = 4;
			Easter_day   = N - 31;
		}
		else
		{
			Easter_month = 3;
			Easter_day   = N;
		}

		intDay   = parseInt(Easter_day); 
		result   = intDay;
		
		intMonth = parseInt(Easter_month); 
		nameMonth = "";
		switch (intMonth) 
		{
			case 1:
				nameMonth = "January";
				break;
			case 2:
				nameMonth = "February";
				break;
			case 3:
				nameMonth = "March";
				break;
			case 4:
				nameMonth = "April";
				break;
			case 5:
				nameMonth = "May";
				break;
			case 6:
				nameMonth = "June";
				break;
			case 7:
				nameMonth = "July";
				break;
			case 8:
				nameMonth = "August";
				break;
			case 9:
				nameMonth = "September";
				break;
			case 10:
				nameMonth = "October";
				break;
			case 11:
				nameMonth = "November";
				break;
			case 12:
				nameMonth = "December";
				break;
		}
		
		result   = result + " " + nameMonth;
		result   = result + " " + intYear; 
		
		document.catholic_form.catholic_result.value= result;
	}
}


// ====================================================================
// 
function orthodoxEaster(_year)
{ 
	clean_orthodoxResult(); 
	Easter_month = 0;
	Easter_day   = 0;
	_year = trim(_year); 
	
	if ( _year == "" )
	{
 		alert("Year must be an integer."); 
 		document.orthodox_form.orthodox_year.focus(); 
 		document.orthodox_form.orthodox_year.select(); 
 		return false;
	}
	else
	{
		intYear  = parseInt(_year); 
		if ( !(intYear >= 0) )
		{
			alert("Year must be a positive integer."); 
			document.orthodox_form.orthodox_year.focus(); 
			document.orthodox_form.orthodox_year.select(); 
			return false;
		}
		
		reminder = intYear % 19;
		switch ( reminder ) 
		{ 
			case 0:
				Easter_month = 4;
				Easter_day   = 19;
				break;
			case 1:
				Easter_month = 4;
				Easter_day   = 8;
				break;
			case 2:
				Easter_month = 4;
				Easter_day   = 27;
				break;
			case 3:
				Easter_month = 4;
				Easter_day   = 16;
				break;
			case 4:
				Easter_month = 4;
				Easter_day   = 5;
				break;
			case 5:
				Easter_month = 4;
				Easter_day   = 24;
				break;
			case 6:
				Easter_month = 4;
				Easter_day   = 13;
				break;
			case 7:
				Easter_month = 5;
				Easter_day   = 2;
				break;
			case 8:
				Easter_month = 4;
				Easter_day   = 21;
				break;
			case 9:
				Easter_month = 4;
				Easter_day   = 10;
				break;
			case 10:
				Easter_month = 4;
				Easter_day   = 29;
				break;
			case 11:
				Easter_month = 4;
				Easter_day   = 18;
				break;
			case 12:
				Easter_month = 4;
				Easter_day   = 7;
				break;
			case 13:
				Easter_month = 4;
				Easter_day   = 26;
				break;
			case 14:
				Easter_month = 4;
				Easter_day   = 15;
				break;
			case 15:
				Easter_month = 4;
				Easter_day   = 4;
				break;
			case 16:
				Easter_month = 4;
				Easter_day   = 23;
				break;
			case 17:
				Easter_month = 4;
				Easter_day   = 12;
				break;
			case 18:
				Easter_month = 5;
				Easter_day   = 1;
				break;
		}
		
		tmp_dow        = 1;
		tmp_day_number = Easter_day;
		tmp_month      = Easter_month - 1;
		
		while (true)
		{
			tmp_easter_date = new Date(intYear,tmp_month,tmp_day_number);	
			tmp_dow = tmp_easter_date.getDay();
			
			if ( tmp_dow == 0 )
			{
				break;
			}
			else
			{
				if ( tmp_month == 2 )
					if ( tmp_day_number == 31 )
					{
						tmp_day_number = 1;
						tmp_month = 3;
					}
					else
					{
						tmp_day_number = tmp_day_number + 1;
					}
				else
					if ( tmp_month == 3 )
						if ( tmp_day_number == 30 )
						{
							tmp_day_number = 1;
							tmp_month = 4;
						}
						else
						{
							tmp_day_number = tmp_day_number + 1;
						}
					else
					if ( tmp_month == 4 )
						if ( tmp_day_number == 31 )
						{
							tmp_day_number = 1;
							tmp_month = 5;
						}
						else
						{
							tmp_day_number = tmp_day_number + 1;
						}
			}
			
		}
		Easter_day   = tmp_day_number;
		Easter_month = tmp_month;
		
		intDay   = parseInt(Easter_day); 
		result   = intDay;
		
		intMonth = parseInt(Easter_month); 
		nameMonth = "";
		switch (intMonth) 
		{
			case 0:
				nameMonth = "January";
				break;
			case 1:
				nameMonth = "February";
				break;
			case 2:
				nameMonth = "March";
				break;
			case 3:
				nameMonth = "April";
				break;
			case 4:
				nameMonth = "May";
				break;
			case 5:
				nameMonth = "June";
				break;
			case 6:
				nameMonth = "July";
				break;
			case 7:
				nameMonth = "August";
				break;
			case 8:
				nameMonth = "September";
				break;
			case 9:
				nameMonth = "October";
				break;
			case 10:
				nameMonth = "November";
				break;
			case 11:
				nameMonth = "December";
				break;
		}
		
		result   = result + " " + nameMonth;
		result   = result + " " + intYear; 
		
		document.orthodox_form.orthodox_result.value= result;
	}
}