// JavaScript Document

function validateForm() {

	var form = document.contactForm;
		
	//Check if all the required fields are filled in
	//****************************************************************************************************
	if (form.name.value == "")
	{
		alert ("Please provide your name.");
		form.name.select();
		return false;	
	}
	
	
	if (form.phone.value == "" && form.email.value == "")
	{
		alert("Please enter either your phone number or your email address");
		form.phone.focus();
		return false;
	}
	else
	{
		//Check Phone Number
		if (form.phone.value && (!isPhoneNumber(form.phone.value)))
		{
			alert("Please enter a phone number in the format 307-555-5555");
			form.phone.select();
			return false;
		}	
		
		//Check whether the email address is in the proper format
		if (form.email.value && ((form.email.value == "") || (!isEmail(form.email.value))))
		{
			alert("Your email address is not in the proper format (e.g. name@provider.com).");		
			form.email.focus();		
			return false;
		}
	}
	
	//Check message	
	if (form.message.value == "")
	{
		alert ("Please provide a message.");
		form.message.focus();
		return false;	
	}
	//End checking for filled in forms
	//****************************************************************************************************

	form.validated.value = "true";
	return true;
}

//checks if the email address is proper format
function isEmail(str)
{
    var regex = /^[-_.a-z0-9]+@(([-_a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
    return regex.test(str);
}

//check for proper phone number format
function isPhoneNumber(str)
{
	if (str.length < 12) //check for required length
	{
		return false;
	}
	if ((str.charAt(3) != "-") || (str.charAt(7) != "-")) //check for 2 required dashes in the phone number
	{
		return false;
	}
	for (var j = 0; j < str.length; j++) // use isNumber() to check if all characters are numeric
	{
		if (str.charAt(j) == "-") 
		{
			j++;
		}
		if (!isNumber(str.charAt(j)))
		{
			return false;
		}
	}
	return true;
}

//checks whether an individual character is numeric or not. Used by isPhoneNumber()
function isNumber(str)
{
	if (str == "") { return false; }
	if (str < "0") { return false; }
	if (str > "9") { return false; }
	return true;
}