function showDiv(divID) {
	if (document.getElementById(divID)){
		//show the hidden div
		if (document.getElementById(divID).style.display != 'block'){
			document.getElementById(divID).style.display = 'block';
			}
		//only hide if another is moused over
		if ((document.getElementById('signin').style.display == 'block') && (divID != 'signin')){
			document.getElementById('signin').style.display = 'none';
			}
		}else{
		//if the divID doesn't exist (i.e. there is no popup), still hide the signin div
		document.getElementById('signin').style.display = 'none';
		}
	}

function changeImage(imageID) {
    document.getElementById(imageID).src = 'images/nav_'+imageID+'2.gif';
    }
function restoreImage(imageID) {
    document.getElementById(imageID).src = 'images/nav_'+imageID+'.gif';
    }