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 = "images/arrow_down.gif";}
	else
		{	myImage.src = "images/arrow_right.gif";}
}