//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");
}
}

//function to swap an image based on its current state
function swapImage(myImage, state) {

if (state == "minus") {

myImage.src = "/images/minus.gif";
}

else {


myImage.src = "/images/plus.gif";
}
}