function addCommas(nStr)
{
	nStr += '';
	x = nStr.split('.');
	x1 = x[0];
	x2 = x.length > 1 ? '.' + x[1] : '';
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(x1)) {
		x1 = x1.replace(rgx, '$1' + '.' + '$2');
	}
	return x1 + x2;
}

function Left(str, n){
	if (n <= 0)
	    return "";
	else if (n > String(str).length)
	    return str;
	else
	    return String(str).substring(0,n);
}


function beregn(weeks, price) {

		res = (weeks * price);
		
		document.getElementById('totalprice').innerHTML = addCommas(res);
		document.getElementById('result').style.display='block';
		document.getElementById('financeprice').innerHTML = Left(addCommas(res / 36), 5);
		document.getElementById('result2').style.display='block';	
		document.getElementById('c_readmore').style.display='block';
	}