function controllo_date() {
		
	 var x=document.md.inizio.value.split("/");
	var z=document.md.fine.value.split("/");
	var first =new Date(x[2],x[1],x[0],00,00,00).getTime();
	var second =new Date(z[2],z[1],z[0],00,00,00).getTime();

		if(second<=first) {
			alert("The departure date is greater than or equal to that of arrival");
			return false;
		}
		else if (document.md.inizio.value==""){
			alert("Select an arrival date");
			return false;
		}
		else if (document.md.fine.value==""){
			alert("Select a departure date");
			return false;
		}	 
        else {
           document.md.submit();
        }
     
  }