var calcUnits = function(seconds, divv, modd) { return ((Math.floor(seconds/divv))%modd).toString(); }
        
		var localDate = new Date();
	 
		var stPatDayBegin = new Date(localDate.getFullYear(), 2, 17);
		var stPatDayEnd = new Date(localDate.getFullYear(),2,18);
	 
     	if (localDate > stPatDayEnd) 
		{
			stPatDayBegin = new Date(localDate.getFullYear() + 1, 2, 17);
			stPatDayEnd = new Date(localDate.getFullYear() + 1, 2, 18);	
		}
		var computeBeginEndTimes = function()
		{
			localDate = new Date();
	 
			stPatDayBegin = new Date(localDate.getFullYear(), 2, 17);
			stPatDayEnd = new Date(localDate.getFullYear(),2,18);
	 
			if (localDate > stPatDayEnd) 
			{
				stPatDayBegin = new Date(localDate.getFullYear() + 1, 2, 17);
				stPatDayEnd = new Date(localDate.getFullYear() + 1, 2, 18);	
			}
		}
        var prefix = 'There are ';
                
        function StringBuilder(value) { this.strings = new Array(''); this.append(value); }
        StringBuilder.prototype.append = function (value) { if (value) { this.strings.push(value); } }
        StringBuilder.prototype.clear = function () { this.strings.length = 1; }
        StringBuilder.prototype.toString = function () { return this.strings.join(''); }
        
        var isStPatricksDay = function() 
		{        
            if (localDate > stPatDayBegin) 
			{
                if (localDate < stPatDayEnd)
                     return "YES";
            }
            return "NO";
        }
        
        var responseColor = function () 
		{
			if (isStPatricksDay() == 'YES')
                return "#73B221";
            return "#000000";
        }
     
        
        var getCountDown = function () 
		{
			localDate = new Date();
 
			if (isStPatricksDay() == 'YES')
                return '';
                
            var differenceMs = new Date(stPatDayBegin - localDate);
            
            if (differenceMs < 0) 
			{
                stPatDayBegin = new Date(localDate.getFullYear()+1, 2, 2);
                stPatDayEnd = new Date(localDate.getFullYear()+1,2,3);
                differenceMs = new Date(stPatDayBegin - localDate);
            }
            var differenceSec = Math.floor(differenceMs.valueOf()/1000);
           
            var countDownOutput = new StringBuilder();
            var daySingluar = 'day';
            var dayPlural = 'days';
            var hourSingular = 'hour';
            var hourPlural = 'hours';
            var minuteSingluar = 'minute';
            var minutePlural = 'minutes';
            var secondSingluar = 'second';
            var secondPlural = 'seconds';
            
            var days = calcUnits(differenceSec,86400,100000);
            var hours = calcUnits(differenceSec,3600,24);
            var minutes = calcUnits(differenceSec,60,60);
            var seconds = calcUnits(differenceSec,1,60);
            countDownOutput.append(prefix);
            
            if (days > 0) 
			{
                countDownOutput.append('<b>');
                countDownOutput.append(days);
                countDownOutput.append('<\/b>');
                countDownOutput.append(' ');
                
                    if (days == 1)
                        countDownOutput.append(daySingluar);
                    else
                        countDownOutput.append(dayPlural);
                
            }
			if (hours > 0)
            {
                countDownOutput.append(', ');
                countDownOutput.append('<b>');
                countDownOutput.append(hours);
                countDownOutput.append('<\/b>');
                countDownOutput.append(' ');
                
                    if (hours == 1)
                        countDownOutput.append(hourSingular);
                    else
                        countDownOutput.append(hourPlural);
                
            }
            if (minutes > 0)
            {
                countDownOutput.append(', ');
                countDownOutput.append('<b>');
                countDownOutput.append(minutes);
                countDownOutput.append('<\/b>');
                
                countDownOutput.append(' ');
                
                    if (minutes == 1)
                        countDownOutput.append(minuteSingular);
                    else
                        countDownOutput.append(minutePlural);
                
            }
            if (seconds > 0)
            {
                if (minutes >0) 
				{
					countDownOutput.append(', ');
                }
				countDownOutput.append('<b>');
                countDownOutput.append(seconds);
                countDownOutput.append('<\/b>');
                
                countDownOutput.append(' ');
                
                    if (seconds == 1)
                        countDownOutput.append(secondSingluar);
                    else
                        countDownOutput.append(secondPlural);
                
            }
            var suffix = ' until St. Patrick\'s Day ' + stPatDayBegin.getFullYear();
            countDownOutput.append(suffix);
			
            return countDownOutput.toString();
        }
		
		var updateYesNo = function() {
			var responseAnchor = document.getElementById('yesNo');
			responseAnchor.innerHTML = isStPatricksDay();
		}
		
		var showHideLeprechan = function() 
		{
			var leprechanDiv = document.getElementById('leprechanDiv');
			
			if (isStPatricksDay() == 'YES')
                	{
				showLeprechan(leprechanDiv);
			}
			else
    			{        
				hideLeprechan(leprechanDiv);
			}
			var thisResponseAnchor = document.getElementById('responseAnchor');
        	thisResponseAnchor.style.color = responseColor();
        	thisResponseAnchor.title = isStPatricksDay();
		    
        	}

		var showLeprechan = function(thisLeprechanDiv)
		{
		   thisLeprechanDiv = document.getElementById('leprechanDiv');
		    thisLeprechanDiv.innerHTML = '<img style=\'display:inline;clear:none;\' src=\'http://www.isitstpatricksday.com/resources/leprechan.gif\' alt=\'leprechan\' />';
		}
		
		var hideLeprechan = function(thisLeprechanDiv)
		{
			thisLeprechanDiv = document.getElementById('leprechanDiv'); 
			thisLeprechanDiv.innerHTML = '<img style=\'display:none;clear:none;\' src=\'http://www.isitstpatricksday.com/resources/leprechan.gif\' alt=\'leprechan\' />';
			computeBeginEndTimes();
		}
		
		var updateCountDownOutput = function()
		{
			var countDownOutputElement = document.getElementById('countDownOutput');
			countDownOutputElement.innerHTML = getCountDown();
			showHideLeprechan();
			updateYesNo();
		}