var Caption="Estimated 2007 property taxes are $";

var TotalTax=0;

var CountyPct=.2;
var CountyOver65=69000;
var CountyDisabled=69000;
var CountyRate=.2281;

var ParklandRate=.254;

var SchoolEqualizationRate=.004714;

var DCCCDPct=.2;
var DCCCDOver65=50000;
var DCCCDDisabled=50000;
var DCCCDRate=.0804;

var CityName="No City";
var CityRate=0;
var CityPct=0;
var CityOver65=0;
var CityDisabled=0;

var SDName="No Special District";
var SDRate=0;
var SDPct=0;
var SDOver65=0;
var SDDisabled=0;

var SchoolName="No School district";
var SchoolRate=0;
var SchoolPct=0;
var SchoolGenHS=15000;
var SchoolOver65=0;
var SchoolDisabled=0;

//	Exemptions
var ExemptionHS=0;
var ExemptionsOver65=0;
var ExemptionsDisabled=0;
var ExemptionsDisabledVet=0;

//	If offered, must be less than $5,000
var MinExemptionHS=5000;

function CityTaxes(iName,iRate,iPct,iOver65,iDisabled)	{
	CityName=iName;
	CityRate=iRate;
	CityPct=iPct;
	CityOver65=iOver65;
	CityDisabled=iDisabled;
}

function SchoolTaxes(iName,iRate,iPct,iOver65,iDisabled)	{
	SchoolName=iName;
	SchoolRate=iRate;
	SchoolPct=iPct;
	SchoolOver65=iOver65;
	SchoolDisabled=iDisabled;
}

function SpecialTaxes(iName,iRate,iPct,iOver65,iDisabled)	{
	SDName=iName;
	SDRate=iRate;
	SDPct=iPct;
	SDOver65=iOver65;
	SDDisabled=iDisabled;
}

function ExemptionsHomestead(iExemptionHS)	{
	ExemptionHS=iExemptionHS;
}

function ExemptionsOther(iExemptionsOver65,iExemptionsDisabled)	{
	ExemptionsOver65=iExemptionsOver65;	
	ExemptionsDisabled=iExemptionsDisabled;
}

function DisabledVet(iDisabledVet)	{
	ExemptionsDisabledVet=iDisabledVet;
}

function CalcTaxes()	{

	TaxValue=strip_out_commas(window.document.realty.appraised.value);

	TotalTax=0;

	if (TaxValue == 0 || isNaN(TaxValue)) {
		alert("Enter Estimated Value");
	} else	{

//	County Taxable Value
var	CoHs = (CountyPct * TaxValue) * ExemptionHS;
	if (CoHs > 0 && CoHs < MinExemptionHS) CoHs = MinExemptionHS;
var	CoO65 = CountyOver65 * ExemptionsOver65 + CountyDisabled * ExemptionsDisabled;
var	CoNV = TaxValue - CoHs - CoO65 - ExemptionsDisabledVet;
	if (CoNV < 0) CoNV = 0;
	insert_appraisals('Co',TaxValue,CoHs,CoO65,ExemptionsDisabledVet,CoNV)	

//	County taxes
	calc_and_insert('Co',CoNV,CountyRate)

//	Parkland Hospital
	calc_and_insert('PH',CoNV,ParklandRate)

//	School Equalizatinon Taxes
	calc_and_insert('SE',CoNV,SchoolEqualizationRate)

//	Dallas County Community College District
var	DCCCDHs = (DCCCDPct * TaxValue) * ExemptionHS;
	if (DCCCDHs > 0 && DCCCDHs < MinExemptionHS) DCCCDHs = MinExemptionHS;
var	DCCCDO65 = DCCCDOver65 * ExemptionsOver65 + DCCCDDisabled * ExemptionsDisabled;
var	DCCCDNV = TaxValue - DCCCDHs - DCCCDO65 - ExemptionsDisabledVet;
	if (DCCCDNV < 0) DCCCDNV = 0;
	insert_appraisals('DCCCD',TaxValue,DCCCDHs,DCCCDO65,ExemptionsDisabledVet,DCCCDNV)	
	calc_and_insert('DCCCD',DCCCDNV,DCCCDRate)

//	City
	CiTaxValue = TaxValue
	if (CityRate == 0) {
		CiNV = 0;
		insert_appraisals('Ci',0,0,0,0,0);
		}

	else	{

	var	CiHs = (CityPct * CiTaxValue) * ExemptionHS;
		if (CiHs > 0 && CiHs < MinExemptionHS) CiHs = MinExemptionHS;
	var	CiO65 = CityOver65 * ExemptionsOver65 + CityDisabled * ExemptionsDisabled;
	var	CiNV = CiTaxValue - CiHs - CiO65 - ExemptionsDisabledVet;
		if (CiNV < 0) CiNV = 0;
		insert_appraisals('Ci',TaxValue,CiHs,CiO65,ExemptionsDisabledVet,CiNV)	
	}
//	City Taxes
	calc_and_insert('Ci',CiNV,CityRate)
	document.getElementById("CiName").innerHTML = CityName;


//	Schools
	ScTaxValue = TaxValue
	if (SchoolRate == 0) {
		ScTaxValue = 0;
		ScNV = 0;
		insert_appraisals('Sc',0,0,0,0,0);
		insert_values('ScGHS',0);
		}

	else	{

		var 	ScGHS = SchoolGenHS * ExemptionHS;
		var	ScHs = (SchoolPct * ScTaxValue) * ExemptionHS;
			if (ScHs > 0 && ScHs < MinExemptionHS) ScHs = MinExemptionHS;
		var	ScO65 = SchoolOver65 * ExemptionsOver65 + SchoolDisabled * ExemptionsDisabled;
		var	ScNV = ScTaxValue - ScGHS - ScHs - ScO65 - ExemptionsDisabledVet;
			if (ScNV < 0) ScNV = 0;
			insert_appraisals('Sc',TaxValue,ScHs,ScO65,ExemptionsDisabledVet,ScNV)	
			insert_values('ScGHS',ScGHS);
	}

//	School Taxes
	calc_and_insert('Sc',ScNV,SchoolRate)
	document.getElementById("ScName").innerHTML = SchoolName;



//	Special Districts
	SDTaxValue = TaxValue
	if (SDRate == 0) {
		SDNV = 0;
		insert_appraisals('SD',0,0,0,0,0);
		}

	else	{

	var	SDHs = (SDPct * SDTaxValue) * ExemptionHS;
		if (SDHs > 0 && SDHs < MinExemptionHS) SDHs = MinExemptionHS;
	var	SDO65 = SDOver65 * ExemptionsOver65 + SDDisabled * ExemptionsDisabled;
	var	SDNV = SDTaxValue - SDHs - SDO65 - ExemptionsDisabledVet;
		if (SDNV < 0) SDNV = 0;
		insert_appraisals('SD',SDTaxValue,SDHs,SDO65,ExemptionsDisabledVet,SDNV)	
	}
//	Special District Taxes
	calc_and_insert('SD',SDNV,SDRate)
	document.getElementById("SDName").innerHTML = SDName;

//	TotalTaxes
	TotalTax = Math.round(TotalTax * 100) / 100;
	document.getElementById("AdValoremTaxes").innerHTML = Caption + format_value(TotalTax)

}
}
//	Parameters: Prefix of data field, Appraised value, Tax rate
function calc_and_insert(TaxWhich,TaxWhat,TaxRate)	{

	insert_values(TaxWhich + 'TR',TaxRate);
var	TheTax = Math.round(TaxWhat * TaxRate) / 100
	insert_values(TaxWhich + 'Tax',TheTax);
	TotalTax = TotalTax + TheTax;
}

function insert_values(where,what)	{
	document.getElementById(where).innerHTML = format_value(what);
}

function insert_appraisals(ApWhich,ApAV,ApHs,ApO65,ApDV,ApNV)	{
	insert_values(ApWhich+'AV',ApAV);
	insert_values(ApWhich+'Hs',ApHs);
	insert_values(ApWhich+'O65',ApO65);
	insert_values(ApWhich+'DV',ApDV);
	insert_values(ApWhich+'NV',ApNV);
}



function format_value(input) {
	var result, len;
	
	input += "";
	len = input.indexOf(".");
	if(len == -1) {
		len = input.length;
		result = "";
	}
	else {
		result = input.substring(len, input.length);
	}
	while(len > 3) {
		result = input.substring(len-3, len) + result;
		result = "," + result;
		len -= 3;
	}
	result = input.substring(0, len) + result;
//	result = "$" + result;

//	Need to append a zero?
	len = input.indexOf(".");
	if(len == input.length - 2) {
		result = result + "0";
	}
	
	if(result == "00")	{result="-"};
	return result;
}

//	Remove commas and $ from input as return as number
//	--------------------------------------------
function strip_out_commas(input) {
	var newnum;
	var ch;
	newnum = "";
	for(var i=0; i<input.length; i++) {
		ch = input.charAt(i);
		if(ch != ",") {
			if(ch != "$") {
				newnum += ch
			}
		}
	}
	return parseFloat(newnum);
}