function $( elementId ) {
	return document.getElementById( elementId );
}

function recalculate_1() {
	sum = $( "creditCalculatorValue1_1" ).value;
	percent = $( "creditCalculatorValue2_1" ).value;
	moth = $( "creditCalculatorValue3_1" ).value;
	if( sum!="" && percent!="" && moth!="" ) {
		first = sum*percent/100/12;
		pow = Math.pow( 1+percent/100/12, -moth );
		total = Math.floor(first/(1-pow));
		$( "result_1" ).innerHTML = total;
	}
}

function reset_1() {
	$( "creditCalculatorValue1_1" ).value = "";
	$( "creditCalculatorValue2_1" ).value = "";
	$( "creditCalculatorValue3_1" ).value = "";
	$( "result_1" ).innerHTML = "";
}

function recalculate_2() {
	sum = $( "creditCalculatorValue1_2" ).value;
	percent = $( "creditCalculatorValue2_2" ).value;
	moth = $( "creditCalculatorValue3_2" ).value;
	if( sum!="" && percent!="" && moth!="" ) {
		first = percent/100/12;
		pow = Math.pow( 1+percent/100/12, -moth );
		total = Math.floor(sum*(1-pow)/first);
		$( "result_2" ).innerHTML = total;
	}
}

function reset_2() {
	$( "creditCalculatorValue1_2" ).value = "";
	$( "creditCalculatorValue2_2" ).value = "";
	$( "creditCalculatorValue3_2" ).value = "";
	$( "result_2" ).innerHTML = "";
}