function showHideItems(myItem, myButton)
{
	var myItem = document.getElementById(myItem);
	var myButton = document.getElementById(myButton);
    if (myItem.style.display != "none") 
	{
        myItem.style.display = "none";
        swapImage(myButton,"plus");
    } else {
        myItem.style.display = "block";
        swapImage(myButton,"minus");
    }
}

function swapImage(myImage, state) 
{
    if (state == "minus") 
	{
        myImage.src = "../imagens/menos.gif";
    } else {
        myImage.src = "../imagens/mais.gif";
	}
}