function changeZIndex_top(i)
{hide_top.style.zIndex=i;}

function changeZIndex_top_off(i)
{hide_top.style.zIndex=i;}

//function to display or hide a given element
		
function showHideItems(myItem, myButton){
		
//this is the ID of the hidden item
var myItem = document.getElementById(myItem);
		
		
//this is the ID of the plus/minus button image
var myButton = document.getElementById(myButton);
		
if (myItem.style.display != "none") {
//items are currently displayed, so hide them
		
myItem.style.display = "none";
		
//swapImage(myButton,"plus");
}
else {
//items are currently hidden, so display them
myItem.style.display = "block";
		
		//swapImage(myButton,"minus");
		}
		}