function validateForm(){

	var msgStart = "You seemed to have not provided the following information:\n";
	var msgBody = "";
	
	if(document.getElementById("firstname").value == "")
	{
		msgBody += "Please supply your first name.\n";
	}
	if(document.getElementById("surname").value == "")
	{
		msgBody += "Please supply your surname.\n";
	}
	if(document.getElementById("email").value == "")
	{
		msgBody += "Please supply your email address.\n";
	}
	if(document.getElementById("daytimetelephone").value == "")
	{
		msgBody += "Please supply a daytime telephone number.\n";
	}
	if(document.getElementById("eveningtelephone").value == "")
	{
		msgBody += "Please supply an evening telephone number.\n";
	}

	if(msgBody != ""){
		alert(msgStart + msgBody);
		return false;
	}
	else{
		document.letting_form.submit();

	}
			
}