function switchDiv()
{
	if (document.getElementById('hb_fields1').style.display == 'none')
	{
		document.getElementById('hb_fields1').style.display = 'block';
		//document.getElementById('hb_fields11').style.display = 'block';
		document.getElementById('hb_fields2').style.display = 'none';
		//document.getElementById('hb_fields21').style.display = 'none';
		
		document.getElementById('hb1value').value = document.getElementById('hb2total').value;
		document.getElementById('hb1first1').value = document.getElementById('hb2first1').value;
		document.getElementById('hb1first2').value = document.getElementById('hb2first2').value;
		document.getElementById('hb1years').value = document.getElementById('hb2years').value;
		document.getElementById('hb1credit').value = document.getElementById('hb2credit').value;
		document.getElementById('hb1interest').value = document.getElementById('hb2interest').value;
		document.getElementById('hb1total').value = document.getElementById('hb2payment').value;	

		document.getElementById('hb_switch').innerHTML = document.getElementById('hb_fields2').getElementsByTagName('h2')[0].innerHTML;
		
		//document.getElementById('bg_img').src = "280x280_1.gif";
		//document.getElementById('switch_btn').src = "hb_ch_1.gif";
	}
	else
	{
		document.getElementById('hb_fields1').style.display = 'none';
		document.getElementById('hb_fields2').style.display = 'block';
		//document.getElementById('hb_fields11').style.display = 'none';
		//document.getElementById('hb_fields21').style.display = 'block';	
		
		document.getElementById('hb2total').value = document.getElementById('hb1value').value;
		document.getElementById('hb2first1').value = document.getElementById('hb1first1').value;
		document.getElementById('hb2first2').value = document.getElementById('hb1first2').value;
		document.getElementById('hb2years').value = document.getElementById('hb1years').value;
		document.getElementById('hb2credit').value = document.getElementById('hb1credit').value;
		document.getElementById('hb2interest').value = document.getElementById('hb1interest').value;
		document.getElementById('hb2payment').value = document.getElementById('hb1total').value;

		document.getElementById('hb_switch').innerHTML = document.getElementById('hb_fields1').getElementsByTagName('h2')[0].innerHTML;

		//document.getElementById('bg_img').src = "280x280_2.gif";
		//document.getElementById('switch_btn').src = "hb_ch_2.gif";
	}
}

var defInterest = 10;
var defYears = 40;


function do_calculation1(tField) {

if (tField=="hb1value")
{
housevalue = document.getElementById('hb1value').value;
first2 = document.getElementById('hb1first2').value;
first1 = document.getElementById('hb1first1').value;

if ((first2 == 0)&&(first1!=0))
	document.getElementById('hb1first2').value = first1 * housevalue / 100;
	
if (first2!=0)
	document.getElementById('hb1first1').value = first2 * 100 / housevalue;

tempInterest = document.getElementById('hb1first1').value;
if (tempInterest < defInterest)
{
document.getElementById('hb1first1').value = defInterest;
document.getElementById('hb1first2').value = defInterest * housevalue / 100;
document.getElementById('hb1credit').value = housevalue - document.getElementById('hb1first2').value;
}


first2 = document.getElementById('hb1first2').value;

document.getElementById('hb1credit').value = housevalue - first2;

}

if (tField=="hb1first1")
{
interest = document.getElementById('hb1first1').value;
housevalue = document.getElementById('hb1value').value;

document.getElementById('hb1first2').value = interest * housevalue / 100;
document.getElementById('hb1credit').value = housevalue - document.getElementById('hb1first2').value;
}

if (tField=="hb1first2")
{
first2 = document.getElementById('hb1first2').value;
housevalue = document.getElementById('hb1value').value;

tempInterest = first2 * 100 / housevalue;
if (tempInterest < defInterest)
{
document.getElementById('hb1first1').value = defInterest;
document.getElementById('hb1first2').value = defInterest * housevalue / 100;
document.getElementById('hb1credit').value = housevalue - document.getElementById('hb1first2').value;
}
else
{
document.getElementById('hb1first1').value = first2 * 100 / housevalue ;
document.getElementById('hb1credit').value = housevalue - document.getElementById('hb1first2').value;
}

}

if (tField=="hb1credit")
{
credit = document.getElementById('hb1credit').value;
housevalue = document.getElementById('hb1value').value;

document.getElementById('hb1first2').value = housevalue - credit;
document.getElementById('hb1first1').value = document.getElementById('hb1first2').value * 100 / housevalue ;

tempInterest = document.getElementById('hb1first1').value;
if (tempInterest < defInterest)
{
document.getElementById('hb1first1').value = defInterest;
document.getElementById('hb1first2').value = defInterest * housevalue / 100;
document.getElementById('hb1credit').value = housevalue - document.getElementById('hb1first2').value;
}

}



pricipal = document.getElementById('hb1credit').value / document.getElementById('hb1years').value / 12;
interest = document.getElementById('hb1credit').value * document.getElementById('hb1interest').value / 100 / 12 ;
document.getElementById('hb1total').value = pricipal + interest ;



document.getElementById('hb1value').value = Math.round(document.getElementById('hb1value').value);
document.getElementById('hb1first1').value = Math.round(document.getElementById('hb1first1').value*10)/10;
document.getElementById('hb1first2').value = Math.round(document.getElementById('hb1first2').value);
document.getElementById('hb1credit').value = Math.round(document.getElementById('hb1credit').value);
document.getElementById('hb1interest').value = Math.round(document.getElementById('hb1interest').value*10)/10;
document.getElementById('hb1years').value = Math.round(document.getElementById('hb1years').value);
document.getElementById('hb1total').value = Math.round(document.getElementById('hb1total').value);

}



function do_calculation2(tField) {

if ((tField=="hb2years")||(tField=="hb2interest")||(tField=="hb2payment") )
{
years = document.getElementById('hb2years').value;
interest = document.getElementById('hb2interest').value;
payment = document.getElementById('hb2payment').value;

document.getElementById('hb2credit').value =  payment / ( (1/(12*years)) + (interest/1200) );
}

if (tField=="hb2credit")
{
pricipal = document.getElementById('hb2credit').value / document.getElementById('hb2years').value / 12;
interest = document.getElementById('hb2credit').value * document.getElementById('hb2interest').value / 100 / 12 ;
document.getElementById('hb2payment').value = pricipal + interest ;
}


document.getElementById('hb2total').value = (document.getElementById('hb2credit').value * 1) + (document.getElementById('hb2first2').value * 1) ;
document.getElementById('hb2first1').value = document.getElementById('hb2first2').value * 100 / document.getElementById('hb2total').value ;


tempInterest = document.getElementById('hb2first1').value;
if (tempInterest < defInterest)
{
document.getElementById('hb2first1').value = defInterest;
document.getElementById('hb2total').value  = (100 * document.getElementById('hb2credit').value ) / ( 100 - defInterest );
document.getElementById('hb2first2').value = document.getElementById('hb2total').value - document.getElementById('hb2credit').value;
}


document.getElementById('hb2payment').value = Math.round(document.getElementById('hb2payment').value);
document.getElementById('hb2first1').value = Math.round(document.getElementById('hb2first1').value*10)/10;
document.getElementById('hb2first2').value = Math.round(document.getElementById('hb2first2').value);
document.getElementById('hb2credit').value = Math.round(document.getElementById('hb2credit').value);
document.getElementById('hb2interest').value = Math.round(document.getElementById('hb2interest').value*10)/10;
document.getElementById('hb2years').value = Math.round(document.getElementById('hb2years').value);
document.getElementById('hb2total').value = Math.round(document.getElementById('hb2total').value);

}