function round(value,precision)
{
	var exp = Math.pow(10,precision);
	
	return Math.round(value*exp)/exp;
}

function initialize()
{
	document.chooseForm.wordsAmount.value="1 235,05";
	
	recalculate(document.chooseForm.wordsAmount);
}

function recalculate(field)
{
	var form = field.form;
		
	var resultDiv = document.getElementById("wordsAmountResult");
	var result = "";

	var wordsAmount = form.wordsAmount.value;

	var numberRegExp = new RegExp("^\\s*[0-9]{1,3}([\\s\\.]*[0-9]{3})*(,[0-9]{1,2})?\\s*$");		
	if(!numberRegExp.test(wordsAmount))
	{
		resultDiv.innerHTML = "Wprowadź prawidłową kwotę.";
		return;
	}

	wordsAmount = wordsAmount.replace(/[\s\.]*/ig,'');

	if(field.id=="wordsButtonAddVat")
	{
		wordsAmount = round(parseFloat(wordsAmount.replace(",","."))*1.23,2);
		form.wordsAmount.value = wordsAmount.toMoney(2,',',' ');
		wordsAmount = wordsAmount.toString().replace(".",",");
	}

	if(field.id=="wordsButtonSubstractVat")
	{
		wordsAmount = round(parseFloat(wordsAmount.replace(",","."))/1.23,2);
		form.wordsAmount.value = wordsAmount.toMoney(2,',',' ');
		wordsAmount = wordsAmount.toString().replace(".",",");
	}

	if(wordsAmount.indexOf(',')>0)
	{
		var rest = wordsAmount.substring(wordsAmount.indexOf(',')+1);
		if(rest.length<2) rest = rest + "0";
		result = translatePart(rest,0);	
		
		wordsAmount = wordsAmount.substring(0,wordsAmount.indexOf(','));
	}
	
	var scale = 1;
	
	while(wordsAmount.length>3)
	{
		result = translatePart(wordsAmount.substring(wordsAmount.length-3,wordsAmount.length), scale) + " " + result;
		wordsAmount = wordsAmount.substring(0,wordsAmount.length-3);
		scale++;
		
		if(scale>6)
		{
			resultDiv.innerHTML = "Za dużo! Nikt na pewno nie ma tyle kasy??? :)";
			return;
		}
	}

	result = translatePart(wordsAmount.toString(), scale) + " " + result;


	resultDiv.innerHTML = "<big>"+result+"</big>";

}

function translatePart(part, scale)
{
	var result = "";

	while(part.length<3) part = "0"+part;

	var wordFlexion = 2;

	switch(part[0]) 
	{
		case '0':
			break;
		case '1':
			result += "sto";
			break;
		case '2':
			result += "dwieście";
			break;
		case '3':
			result += "trzysta";
			break;
		case '4':
			result += "czterysta";
			break;
		case '5':
			result += "pięćset";
			break;
		case '6':
			result += "sześćset";
			break;
		case '7':
			result += "siedemset";
			break;
		case '8':
			result += "osiemset";
			break;
		case '9':
			result += "dziewięćset";
			break;
	}

	switch(part[1]) 
	{
		case '0':
			break;
		case '1':
			switch(part[2])
			{
				case '0':
					result += " dziesięć";
					break;
				case '1':
					result += " jedenaście";
					break;
				case '2':
					result += " dwanaście";
					break;
				case '3':
					result += " trzynaście";
					break;
				case '4':
					result += " czternaście";
					break;
				case '5':
					result += " piętnaście";
					break;
				case '6':
					result += " szesnaście";
					break;
				case '7':
					result += " siedemnaście";
					break;
				case '8':
					result += " osiemnaście";
					break;
				case '9':
					result += " dziewiętnaście";
					break;
			}
			break;
		case '2':
			result += " dwadzieścia";
			break;
		case '3':
			result += " trzydzieści";
			break;
		case '4':
			result += " czterdzieści";
			break;
		case '5':
			result += " pięćdziesiąt";
			break;
		case '6':
			result += " sześćdziesiąt";
			break;
		case '7':
			result += " siedemdziesiąt";
			break;
		case '8':
			result += " osiemdziesiąt";
			break;
		case '9':
			result += " dziewięćdziesiąt";
			break;
	}

	if(!(part[1]=='1'))
	{
		switch(part[2])
		{
			case '0':
				break;
			case '1':
				result += " jeden";
				if(part[0]=='0' && part[1]=='0') wordFlexion = 0;
				break;
			case '2':
				result += " dwa";
				wordFlexion = 1;
				break;
			case '3':
				result += " trzy";
				wordFlexion = 1;
				break;
			case '4':
				result += " cztery";
				wordFlexion = 1;
				break;
			case '5':
				result += " pięć";
				break;
			case '6':
				result += " sześć";
				break;
			case '7':
				result += " siedem";
				break;
			case '8':
				result += " osiem";
				break;
			case '9':
				result += " dziewięć";
				break;
		}
	}
	
	if(result.length>0)
	{	
		switch(scale)
		{
			case 0:
				switch(wordFlexion)
				{
					case 0:
						result += " grosz";
						break;
					case 1:
						result += " grosze";
						break;
					case 2:
						result += " groszy";
						break;	 
				}
				break;
			case 1:
				switch(wordFlexion)
				{
					case 0:
						result += " złoty";
						break;
					case 1:
						result += " złote";
						break;
					case 2:
						result += " złotych";
						break;	 
				}
				break;
			case 2:
				switch(wordFlexion)
				{
					case 0:
						result += " tysiąc";
						break;
					case 1:
						result += " tysiące";
						break;
					case 2:
						result += " tysięcy";
						break;	 
				}
				break;
			case 3:
				switch(wordFlexion)
				{
					case 0:
						result += " milion";
						break;
					case 1:
						result += " miliony";
						break;
					case 2:
						result += " milionów";
						break;	 
				}
				break;
			case 4:
				switch(wordFlexion)
				{
					case 0:
						result += " miliard";
						break;
					case 1:
						result += " miliardy";
						break;
					case 2:
						result += " miliardów";
						break;	 
				}
				break;
			case 5:
				switch(wordFlexion)
				{
					case 0:
						result += " bilion";
						break;
					case 1:
						result += " biliony";
						break;
					case 2:
						result += " bilionów";
						break;	 
				}
				break;
			case 6:
				switch(wordFlexion)
				{
					case 0:
						result += " biliard";
						break;
					case 1:
						result += " biliardy";
						break;
					case 2:
						result += " biliardów";
						break;	 
				}
				break;
			case 7:
				switch(wordFlexion)
				{
					case 0:
						result += " trylion";
						break;
					case 1:
						result += " tryliony";
						break;
					case 2:
						result += " trylionów";
						break;	 
				}
				break;
			case 8:
				switch(wordFlexion)
				{
					case 0:
						result += " tryliard";
						break;
					case 1:
						result += " tryliardy";
						break;
					case 2:
						result += " tryliardów";
						break;	 
				}
				break;
			case 9:
				switch(wordFlexion)
				{
					case 0:
						result += " kwadrylion";
						break;
					case 1:
						result += " kwadryliony";
						break;
					case 2:
						result += " kwadrylionów";
						break;	 
				}
				break;
			}
	}
	return result;
}

function selectInput(field)
{
	addClass(field,"input_selected");
	
	for(var i = 0; i < document.forms.length; i++)	
		for(var j = 0; j < document.forms[i].elements.length; j++)
   	{
			var currentElement = document.forms[i].elements[j];
		
			if(currentElement == field)
				continue;
			
			removeClass(currentElement,"input_selected");
		}
}

function addClass(item, classname) 
{
    var obj = item
    if (typeof item=="string") {
        obj = document.getElementById(item)
    }
    obj.className += " " + classname
}

function removeClass(item, classname) 
{
    var obj = item
    if (typeof item=="string") {
        obj = document.getElementById(item)
    }
    var classes = ""+obj.className
    while (classes.indexOf(classname)>-1) {
        classes = classes.replace (classname, "")
    }
    obj.className = classes
}

Number.prototype.toMoney = function(decimals, decimalSeparator, thousandsSeparator)
{ 
   var n = this;
   c = isNaN(decimals) ? 2 : Math.abs(decimals);
   d = decimalSeparator || '.';
   t = (typeof thousandsSeparator === 'undefined') ? ' ' : thousandsSeparator;
   sign = (n < 0) ? '-' : '',

   i = parseInt(n = Math.abs(n).toFixed(c)) + '', 
   j = ((j = i.length) > 3) ? j % 3 : 0; 

   return sign + (j ? i.substr(0, j) + t : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : ''); 
}

String.prototype.startsWith = function (str)
{
    return this.indexOf(str) == 0;
};