function byID(id)
{
	var obj;
	if (document.getElementById) obj = document.getElementById(id);
	else if (document.all) obj = document.all[id];
	else if (document.layers) {
		obj 	  = document.layers[id];
		obj.style = document.layers[id];	
	}
	return obj;	
}

var ns4 = (document.layers)? true:false;
var ns6 = (document.getElementById) && !(document.all)? true:false;

function checkRegister()
{
	if (document.forms.register.podmiot[1].checked) {
		byID('osoba-prywatna').style.display = 'none';
		byID('firma').style.display = 'block';
	} else {
		byID('osoba-prywatna').style.display = 'block';
		byID('firma').style.display = 'none';
	}	
}

function checkWysylka(t, id)
{
	if (t.checked) {
		byID(id).style.display = 'block';
	} else {
		byID(id).style.display = 'none';
	}	
}

function addShippingCost(price)
{
	byID("total_shipping_cost").innerHTML = price + " zł";
}