function tosggleDiv (divID) {
var divEl = document.getElementById(divID);
   if(divEl.style.display == 'none' || divEl.style.display == '') { 
      divEl.style.display = 'block';
   }
   else if(divEl.style.display == 'block') {
      divEl.style.display = 'none';
   }
}

// Returns array with x,y page scroll values.
// Code from - quirksmode.org

function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

// Returns array with page width, height and window width, height
// Code from - quirksmode.org

function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}


function toggleDiv()
{

	// prep objects
	var overlay = document.getElementById('layerOverlay');
	var layerContent = document.getElementById('layerContent');

if (overlay.style.display == 'none' || overlay.style.display == ''){
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	// set height of Overlay to take up whole page and show
	overlay.style.height = (arrayPageSize[1] + 'px');
	overlay.style.display = 'block';
	layerContent.style.display = 'block';
	// center lightbox and make sure that the top and left values are not negative
	// and the image placed outside the viewport
	var layerTop = arrayPageScroll[1] + ((arrayPageSize[3] - parseInt(layerContent.offsetHeight)) / 2);
	var layerLeft = ((arrayPageSize[2] - parseInt(layerContent.offsetWidth)) / 2);
	
	//layerContent.style.top = (layerTop < 0) ? "0px" : layerTop + "px";
	//layerContent.style.left = (layerLeft < 0) ? "0px" : layerLeft + "px";

	layerContent.style.top = layerTop + "px";
	layerContent.style.left = layerLeft + "px";
		


	// After image is loaded, update the overlay height as the new image might have
	// increased the overall page height.
	arrayPageSize = getPageSize();
	overlay.style.height = (arrayPageSize[1] + 'px');
		
	return false;
	}
else {
overlay.style.display = 'none';
layerContent.style.display = 'none';
}
}