// JavaScript Document
var state = 'hidden';
function showLayer(whichLayer, whichPic, whichTitle, whichDesc, imageWidth, imageHeight){
	if(state == 'hidden'){
		state = 'visible';
	}else{
		state = 'hidden';
	}
	elem = document.getElementById(whichLayer);
	elem.style.visibility = state;
	elem2 = document.getElementById('overlayBg');
	elem2.style.visibility = state;
	elem3 = document.getElementById('overlayClose');
	elem3.style.visibility = state;
	elem4 = document.getElementById('photoText');
	if(state == 'visible'){
	document.getElementById('placeholder').src = whichPic;
	var w = imageWidth;
	var h = imageHeight;
	elem.style.width = w + 'px';
	document.getElementById('title').childNodes[0].nodeValue = whichTitle;
	document.getElementById('desc').childNodes[0].nodeValue = whichDesc;
	var th = elem4.clientHeight;
	elem.style.marginLeft = -(w/2) - 20 + 'px';
	elem.style.marginTop = -(h/2) - (th/2) - 20 + 'px';
	if(navigator.appVersion.indexOf('MSIE 6') != -1){
		elem3.style.marginLeft = (w/2) - 7 + 'px';
	}else{
		elem3.style.marginLeft = (w/2) + 30 + 'px';
	}
	elem3.style.marginTop = -(h/2) - (th/2) - 30 + 'px';
	}else{
	document.getElementById('placeholder').src = "images/blank.jpg";
	}
}

/*function startPolling(){
	setInterval("poll()",100)
}

function poll(){
	if (navigator.appName == "Microsoft Internet Explorer"){
		var position = document.body.scrollTop;
	}else{
		var position = window.pageYOffset;
	}
	document.getElementById('overlayBg').style.marginTop = position + 'px';
}
startPolling();*/