plusImg = new Image();
plusImg.src = "/image_oa/plus.png"
minusImg = new Image();
minusImg.src = "/image_oa/minus.png"

function hideLevel( _levelId, _imgId ) {
	var thisLevel = document.getElementById( _levelId );
	var thisImg = document.getElementById( _imgId );
	thisLevel.style.display = "none";
	thisImg.src = plusImg.src;
}
	
function hideAll() {
	hideLevel("attributes", "chapImg");
	hideLevel("projectlinks", "projImg");
	hideLevel("interestlinks", "intsImg");
}
	
function showLevel( _levelId, _imgId ) {
	var thisLevel = document.getElementById( _levelId );
	var thisImg = document.getElementById( _imgId );
	if ( thisLevel.style.display == "none") {
		thisLevel.style.display = "block";
		thisImg.src = minusImg.src;
		}
	else {
		hideLevel( _levelId, _imgId);
		}
}

function showOnly( _levelId, _imgId ) {
	var thisLevel = document.getElementById( _levelId );
	var thisImg = document.getElementById( _imgId );
    if ( thisLevel.style.display == "none") {
        thisLevel.style.display = "block";
	    thisImg.src = minusImg.src;
	}
}