// PRE-CACHE PLUS AND MINUS SYMBOL GRAPHICS
var plusgif = new Image;
var minusgif = new Image;
//plusgif = "/assets/images/plus.gif";
//minusgif = "/assets/images/minus.gif";
plusgif.src = "/assets/images/leftnav/grey_arrow_right_cropped.gif";
minusgif.src = "/assets/images/leftnav/grey_arrow_down_cropped.gif";

/****************************************************************************************
    function:        handleMenu
    description:     expands and collapses the left navigation using javascript
    parameters:      menuID -- the numerical ID of the menu and node image
****************************************************************************************/

function handleMenu ( menuID ) {
	var myDiv;
	var myNodeImg;

	if (menuID != "") {

		if (document.getElementById) {

			myDiv = document.getElementById( "div" + menuID );
			myNodeImg = document.getElementById( "nodeimg" + menuID );

			if (myDiv.style.display == "none") {
				myDiv.style.display = "block";
				//myNodeImg.src = "/assets/images/leftnav/grey_arrow_down.gif"
				myNodeImg.src = minusgif.src;
			} else {
				myDiv.style.display = "none";
				//myNodeImg.src = "/assets/images/leftnav/grey_arrow_right.gif"
				myNodeImg.src = plusgif.src;
			}
		}
	}

	return 0;
}