//checks the contact form for empty fields before sending
function check_form(form,lang) {
	if(lang=="da") {
		error_name = "Venligst udfyld Deres navn.";
		error_email = "Venligst udfyld Deres e-mail adresse.";
		error_comments = "Venligst skriv en besked.";
		error_invalid_email = "Den indtasted e-mail adresse er ikke gyldig.";
		error_friend_name = "Venligst udfyld Deres vens navn.";
		error_friend_email = "Venligst udfyld Deres vens e-mail adresse.";
	} else {
		error_name = "Please enter your name.";
		error_email = "Please enter your e-mail address.";
		error_comments = "Please enter a message.";
		error_invalid_email = "The e-mail address entered is not valid.";
		error_friend_name = "Please enter the name of your friend.";
		error_friend_email = "Please enter the e-mail address of your friend.";
	}
	
	var friend_name_field = document.getElementById('friend_name');
	var friend_email_field = document.getElementById('friend_email');
	
	if(friend_name_field) {
		if(form.friend_name.value == "") {
				alert(error_friend_name);
				form.friend_name.focus();
				return false;
		}			
	}
	if(friend_email_field) {
		if(form.friend_email.value == "") {
				alert(error_friend_email);
				form.friend_email.focus();
				return false;
		} else {
			with (form.friend_email.value) {
				apos=form.friend_email.value.indexOf("@")
				dotpos=form.friend_email.value.lastIndexOf(".")
				if (apos<1||dotpos-apos<2) {
					alert(error_invalid_email);
					form.friend_email.focus();
					return false
				}
			}
		}
	}
	
	
	if(form.name.value == "") {
		alert (error_name);
		form.name.focus();
		return false;
	}
	if(form.email.value != "") {
		with (form.email.value) {
			apos=form.email.value.indexOf("@")
			dotpos=form.email.value.lastIndexOf(".")
			if (apos<1||dotpos-apos<2) {
				alert(error_invalid_email);
				form.email.focus();
				return false
			}
		}
	}
	if(form.email.value == "") {
		alert (error_email);
		form.email.focus();
		return false;
	}
	if(form.comments.value == "") {
		alert (error_comments);
		form.comments.focus();
		return false;
	}
}//end check_form
function check_ref(form) {
	if(form.lang.value=="da") {
		error_txt = "Venligst indtast et bolig referencenummer.";
	} else {
		error_txt = "Please enter a property reference id";
		}
	if(form.id.value == "") {
		alert (error_txt);
		form.id.focus();
		return false;
	}	
}