function validate(theForm) 
	{
		if (theForm.txtarrival.value == "")
  			{
			alert("Please, enter arrival date");
			theForm.txtarrival.focus();
			return (false);
  			}
		if (theForm.txtdeparture.value == "")
  			{
			alert("Please, enter departure date");
			theForm.txtdeparture.focus();
			return (false);
  			}
		if (theForm.txtfirstname.value == "")
  			{
			alert("Please, enter your first name");
			theForm.txtfirstname.focus();
			return (false);
  			}  
		if (theForm.txtlastname.value == "")
  			{
			alert("Please, enter your last name");
			theForm.txtlastname.focus();
			return (false);
  			}   
  		if (theForm.txtphone.value == "")
  			{
			alert("Please, enter your phone");
			theForm.txtphone.focus();
			return (false);
  			}   	  	
  		else if(theForm.txtemail.value == "") {
        	alert("Please enter your email");
        	theForm.txtemail.focus();
        	return false;
        	}
        	
  	  return (true);
	}