function showPic(pic){
var picLayer = document.getElementById('bigPic');
var baseDir = "images/portfolio/bp/"

picLayer.style.visibility = "visible";

picLayer.innerHTML = '<a href=\"#\" onClick=\"hidePic()\"><img src=\"' + baseDir + pic + '\"></a><br />click anywhere on the picture to hide it';
}


function hidePic() {
var picLayer = document.getElementById('bigPic');
picLayer.innerHTML = '';
picLayer.style.visibility = 'hidden';
}