madad = getParametrFromDB(first_year, first_month, second_year, second_month);

function getParametrFromDB(first_year, first_month, second_year, second_month)
	{
	    var value;
	    $.ajax({ 
            url:"php/operations.php", 
		    type: 'post',
            data:{ year_one: first_year, month_one: first_month, year_two: second_year, month_two: second_month },
            success:function(result){
                alert("result = " + result);			
			    value = result;
            } 
        });
		alert("value = " + value);		
		return value;
	}