//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 = "http://www.181.fm/images/minus.gif";
        }
        else {
            myImage.src = "http://www.181.fm/images/plus.gif";
        }
    }