function focusLabels()
{
	if(!document.getElementsByTagName) return false;
	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 resetFields(whichForm)
{
	for(var i=0; i<whichForm.elements.length; i++)
	{
		var element = whichForm.elements[i];
		if(element.type == "submit") continue;
		if(element.type == "reset") continue;
		if(!element.defaultValue) continue;
		element.onfocus = function()
		{
			if (this.value == this.defaultValue)
			{
				this.value = "";
			}
		}
		element.onblur = function()
		{
			if(this.value == "")
			{
				this.value = this.defaultValue;
			}
		}
	}
}

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

function isFilled(field)
{
	if (field.value.length < 1 || field.value == field.defaultValue)
	{
		return false;
	}
	else
	{
		return true;
	}
}

function isEmail(field)
{
	if (field.value.indexOf("@") == -1 || field.value.indexOf(".") == -1)
	{
		return false;
	}
	else
	{
		return true;
	}
}

function validateForm(whichForm)
{
	for(var i=0; i<whichForm.elements.length; i++)
	{
		var element = whichForm.elements[i];
		if (element.className.indexOf("required") != -1)
		{
			if (!isFilled(element))
			{
				alert("Please fill in the "+element.name+" field.");
				return false;
			}
		}
		if (element.className.indexOf("email") != -1)
		{
			if (!isEmail(element))
			{
				alert("Invalid "+element.name+" address.");
				return false;
			}
		}
	}
	return true;
}

addLoadEvent(focusLabels);
addLoadEvent(prepareForms);