function checkEnqForm(enquiry) {
	var why = "";
	

		why += isEmpty(enquiry.fname.value, "FIRST NAME");
		if (why != "") {
			alert(why);
			enquiry.fname.focus();
			return false;
		}
		why += isEmpty(enquiry.lname.value, "LAST NAME");
		if (why != "") {
			alert(why);
			enquiry.lname.focus();
			return false;
		}

		why += isEmpty(enquiry.date.value, "DATE");
		if (why != "") {
			alert(why);
			enquiry.date.focus();
			return false;
		}

		why += isEmpty(enquiry.time.value, "TIME");
		if (why != "") {
			alert(why);
			enquiry.time.focus();
			return false;
		}
		
		why += isEmpty(enquiry.guests.value, "NUMBER OF GUESTS");
		if (why != "") {
			alert(why);
			enquiry.guests.focus();
			return false;
		}
		
		why += isEmpty(enquiry.tel.value, "PHONE NUMBER");
		if (why != "") {
			alert(why);
			enquiry.tel.focus();
			return false;
		}
		
		why += checkEmail(enquiry.email.value, "EMAIL");
		if (why != "") {
		alert(why);
		enquiry.email.focus();
		return false;
		}

			
	return true;
	}


function checkEmail (strng) {
var error="";
if (strng == "") {
   error = "You didn't enter an email address.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Please enter a valid email address.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The email address contains illegal characters.\n";
       }
    }
return error;    
}

// non-empty textbox

function isEmpty(strng, fldName) {
var error = "";
  if (strng.length == 0) {
     error = "The " + fldName + " field has not been filled in.\n"
  }
return error;	  
}

// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a phone number.\n";
}

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.";
  
    }
    if (!(stripped.length == 10)) {
	error = "The phone number is the wrong length. Make sure you included an area code.\n";
    } 
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, fldName) {
var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the " + fldName + " drop-down list.\n";
    }    
return error;
}