window.onload = init;

function init()
{
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById) return false;
	prepareForms();
}

function prepareForms()
{
	for (var i = 0; i < document.forms.length; i++)
	{
		var thisForm = document.forms[i];
		focusLabels();
		thisForm.onsubmit = function()
		{
			return validateForm(this);
		}
	}
}

function focusLabels()
{
	var labels = document.getElementsByTagName("label");
	for (var i = 0; i < labels.length; i++)
	{
		if (!labels[i].getAttribute("for")) continue;
		labels[i].onclick = function()
		{
			var id = this.getAttribute("for");
			if (!document.getElementById(id)) return false;
			var element = document.getElementById(id);
			element.focus;
		}
	}
}

function validateForm(whichForm)
{
	var errMsg = "";
	var lineNo = 1;
	for (var i = 0; i < whichForm.elements.length; i++)
	{
		var element = whichForm.elements[i];
		if (element.className.indexOf("required") != -1)
		{
			if (!isFilled(element) || isDefaultValue(element))
			{
				if (whichForm.id == "enquiryForm")
				{
					if (element.name == "first_name")
					{
						errMsg += lineNo + ". Your first name is blank.\n";
						highlightElement(element);
						lineNo++;
					}
					if (element.name == "last_name")
					{
						errMsg += lineNo + ". Your last name is blank.\n";
						highlightElement(element);
						lineNo++;
					}
					if (element.name == "telephone")
					{
						errMsg += lineNo + ". Your telephone number is blank.\n";
						highlightElement(element);
						lineNo++;
					}
					if (element.name == "email")
					{
						errMsg += lineNo + ". Your email address is blank.\n";
						highlightElement(element);
						lineNo++;
					}
				}
			}
		}
		if (element.className.indexOf("email") != -1)
		{
			if (isFilled(element) && !isEmailAddress(element.value))
			{
				if (element.name == "email")
				{
					errMsg += lineNo + ". Your email address is invalid.\n";
					highlightElement(element);
					lineNo++;
				}
			}
		}
	}
	if (errMsg != "")
	{
		showErr(whichForm, errMsg);
		return false;
	}
	else
	{
		return true;
	}
}

function isFilled(elm)
{
	if (elm.value.length < 1)
	{
		return false;
	}
	else
	{
		return true;
	}
}

function isDefaultValue(elm)
{
	if (elm.value == elm.defaultValue)
	{
		return true;
	}
	else
	{
		return false;
	}
}

function isEmailAddress(email)
{
	// Pattern contains all the chars it is okay to use in the local part of an email address
	// For further information visit http://www.remote.org/jochen/mail/info/chars.html
	var pattern = new RegExp(/^([a-zA-Z0-9_\-\.\+]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/i);
	if (!pattern.test(email))
	{
		return false;
	}
	else
	{
		return true;
	}
}

function highlightElement(thisElement)
{
	thisElement.style.color = "red";
	thisElement.style.borderColor = "red";
	thisElement.style.borderStyle = "solid";
}

function showErr(thisForm, ErrMsg)
{
	var ErrMsg = "The following errors were found with your submission:\n\n" + ErrMsg;
	alert(ErrMsg);
	return false;
}