$(function() {
	
});



function roll_over(img_name, img_src)
{
	document[img_name].src = img_src;
}

function clearText(thefield)
{
	if (thefield.defaultValue==thefield.value)
		thefield.value = ""
} 

function fillText(thefield, val)
{
	if (thefield.value == "")
		thefield.value = val;
}

function validate_email(str) {
	var at="@"
		var dot="."
			var lat=str.indexOf(at)
			var lstr=str.length
			var ldot=str.indexOf(dot)
			if (str.indexOf(at)==-1){
				return false;
			}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		return false;
	}

	if (str.indexOf(at,(lat+1))!=-1){
		return false;
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false;
	}

	if (str.indexOf(dot,(lat+2))==-1){
		return false;
	}

	if (str.indexOf(" ")!=-1){
		return false;
	}

	return true;

}

function sendContact()
{
	var name = document.getElementById('name').value;
	var email = document.getElementById('email').value;
	var comments = document.getElementById('comments').value;
	var ok = true;
	
	// check if name is filled
	if (name == '' || name == 'Nome')
	{
		alert('Por favor, indique-nos o seu nome');
		document.getElementById('name').focus();
		ok = false;
		return false;	
	}
 
	// check if email is filled
	if (email == '' || email == 'E-mail')
	{
		alert('Por favor indique-nos o seu email');
		document.getElementById('email').focus();
		ok = false;
		return false;	
	}
	
	// check if email is valid
	if (!validate_email(email))
	{
		alert('O email fornecido não é válido');
		document.getElementById('email').focus();
		ok = false;
		return false;	
	}
	
	// check if a message was given
	if (comments == '' || comments == 'Comentários')
	{
		alert('Por favor, preencha o campo mensagem');
		document.getElementById('comments').focus();
		ok = false;
		return false;	
	}
	
	
	// submit form if all is ok!
	if (ok)
	{
		document.frmContactUs.submit();
	}
}