function form_validate(frm){
			var datefrom=str_to_dateobj(document.getElementById('datefrom').value);
			var dateto=str_to_dateobj(document.getElementById('dateto').value);
			if (dateto.getTime() <= datefrom.getTime()){
				//alert ('datefrom='+datefrom+', dateto='+dateto);
				alert(arrival_date_must_be_less);
				return false;
			}
			return true;
		}
		function set_date(day, id_day, strdate,  id_date, prefix){
			var dates=strdate.split('.');
			var d=dates[0];
			var m=dates[1];
			var y=dates[2];
			var suffix='.'+m+'.'+y;
			for (var i=1; i<32; i++){
				if (document.getElementById(prefix+i+suffix)){
					document.getElementById(prefix+i+suffix).className='';

				}
			}
			document.getElementById(prefix+strdate).className='active';
			document.getElementById(id_date).innerHTML=strdate;
			document.getElementById(id_day).value=day;
		}