function makeConversion() {
	if($('ammount').value != "")	{
		var result = parseFloat($('ammount').value) * parseFloat($('convert_from').value) / parseFloat($('convert_to').value);
		
		$('result').value = Math.round(result *100 ) / 100;
		$('tva_ammount').value = Math.round(result * 100 * 0.19) / 100;
		$('result_tva').value = Math.round(result * 100 * 1.19) / 100;
		
	} else {
		
		$('result').value = "";
		$('tva_ammount').value = "";
		$('result_tva').value = "";
	}
}