function m_s_validate()
{
// cur date value
 var Date_now=new Date();
 var now_day=Date_now.getDate();
 var now_month=Date_now.getMonth();
 var now_year=Date_now.getFullYear();
 var Date_0_now = new Date(now_year, now_month, now_day);
 var now=Date_0_now.valueOf();
// arrival date value
 var arrDate = document.getElementById('m_s_date_arr').value.split('/');
 var Date_arr = new Date(arrDate[2], arrDate[1] - 1, arrDate[0]);
 var start= Date_arr.valueOf();
// departure date value
 var depDate = document.getElementById('m_s_date_dep').value.split('/');
 var Date_dep = new Date(depDate[2], depDate[1] - 1, depDate[0]);
 var end = Date_dep.valueOf();
 if (now > start)
   {
    alert("Please, select Check-in data correctly");
    return false;
   }
 else
   {
    if (start>=end)
      {
       alert("Please, select Check-out data correctly");
       return false;
      }
    if ( (end - start) > 30*24*60*60*1000)
      {
       alert ("The booking period must not exceed 30 days");
       return false;
      }
   }
 document.m_s.stars.value=m_s_form_arr();
 document.getElementById('first_td').style.display='none';
 document.getElementById('second_td').style.display='';
 return true;
}

function m_s_form_arr(){
	var IDS = new Array;
	var j=0;
		for (var i=0; i < document.m_s.elements.length; i++){
				if (document.m_s.elements[i].type == "checkbox" && document.m_s.elements[i].checked){
				IDS [j] = document.m_s.elements[i].value;
				j++
		}
	}	
	
	var string = IDS.join(",");
	if (IDS[0] == "0"){string="";}
	return string;
	}