function showPic(imgFile){

var picDiv = document.getElementById("picLayer");
picDiv.style.visibility = 'visible';
picDiv.innerHTML='<br /><br />click the image to hide it<br /><br /><img src="images/' + imgFile + '" onClick="hidePic();">';
	
}

function hidePic(){

var picDiv = document.getElementById("picLayer");
picDiv.style.visibility = 'hidden';
picDiv.innerHTML='';
}