function toggleCollapsableContent(elementid) {
    var contentElement = document.getElementById("content" + elementid);
    var buttonElement = document.getElementById("button" + elementid);
    if (contentElement && buttonElement) {
        if (contentElement.style.display != "block") {
            contentElement.style.display = "block";
            buttonElement.src = buttonElement.src.replace("plus.gif", "minus.gif");
        }
        else {
            contentElement.style.display = "none";
            buttonElement.src = buttonElement.src.replace("minus.gif", "plus.gif");
        }
    }
}