function validQuantity(textBoxId, errorLabelId, pack)
{
    var textBox = document.getElementById(textBoxId);
    var errorLabel = document.getElementById(errorLabelId);
    var valid = false;
    if (isNaN(textBox.value) || textBox.value < 0)
    {
        errorLabel.innerHTML = '&nbsp;&nbsp;&nbsp;Incorrecto!';
    }
    else if (textBox.value % pack > 0)
    {
        errorLabel.innerHTML = '&nbsp;&nbsp;&nbsp;Pack!';
    }
    else
    {
        errorLabel.innerHTML = "";
        valid = true;
    }
    
    return valid;
}

function deactivateEnter(myfield,e)
{
	var keycode;
	if (window.event)
		keycode = window.event.keyCode;
	else
		if (e) keycode = e.which;
	else 
		return true;

	if (keycode == 13)
	{
		return false;
	}
	else
		return true;
}

function submitenter(myfield,e,button)
{
	var keycode;
	if (window.event)
		keycode = window.event.keyCode;
	else
		if (e) keycode = e.which;
	else 
		return true;

	if (keycode == 13)
	{
		//button.click();
		var action = unescape(button.href);
		eval(action);
		return false;
	}
	else
		return true;
}