function on_calc_click_1()
{	
	var before_after = document.getElementById('before_after');
	var current_date = getFieldDate(document.getElementById('date_reference').innerHTML);
		
	var days = parseInt(get_value('days'));
	
	if (before_after.value=='-')
	{
		days *= -1;
	}
	
	current_date.setDate(current_date.getDate() + days);
	
	var strings = ["לפני", "אחרי"];
	
	document.getElementById('result').innerHTML = "התאריך שחל " + Math.abs(days) + " ימים " + strings[before_after.selectedIndex] + " ה-" + document.getElementById('date_reference').innerHTML + " הוא ה-" + getDateString(current_date);
}


function init_calculator()
{	
	document.getElementById('date_reference').innerHTML = getDateString(new Date());
}

init_calculator();