function changeMainImage(src)
{
	document.getElementById('imageMain').src = src;
}

function getElement(id)
{
	return document.getElementById(id);
}

function checkSubscribeForm()
{
	var result = true;
	var idFocus = null;
	var errMessage = "";

	if (getElement('email').value.length < 5)
	{
		result = false;
		errMessage += "- Provide an email\n";
		if (!idFocus)
			idFocus = 'email';
	}
	else
	{
		if (getElement('email').value.indexOf('@') == -1)
		{
			result = false;
			errMessage += "- Check email validity\n";
			if (!idFocus)
				idFocus = 'email';
		}
	}

	if (getElement('name').value.length < 3)
	{
		result = false;
		errMessage += "- Provide your name\n";
		if (!idFocus)
			idFocus = 'name';	
	}

	if (getElement('state').value == 0)
	{
		result = false;
		errMessage += "- Select a state\n";
		if (!idFocus)
			idFocus = 'state';
	}

	if (getElement('business').checked && getElement('business-name').value.length < 3)
	{
		result = false;
		errMessage += "- Provide a company name\n";
		if (!idFocus)
			idFocus = 'business-name';
	}

	if (! result)
	{
		alert(errMessage);					
		if (idFocus)
			getElement(idFocus).focus();						
	}

	return result;
}