function pic(path, bpath)
{

 document.getElementById('bigp').src = path;
 big_path = bpath;
 
}

function show_pic()
{

  if (window.innerWidth)
    {
     windowWidth = window.innerWidth;
     windowHeight = window.innerHeight;
    }
    else
    {
     windowWidth = document.body.clientWidth;
     windowHeight =document.body.clientHeight;
    }

  var photo_image = document.getElementById('big_photo_img');
			photo_image.src = big_path;
  var photo_layer = document.getElementById('big_photo');
 	   
  photo_layer.style.display = '';
  photo_layer.style.visibility = '';

  photo_layer.style.left = (windowWidth  - 640)/2 + 'px';
  photo_layer.style.top  = (windowHeight - 640)/2 + 'px';  

}

function pos_pic()
{

  var photo_image = document.getElementById('big_photo_img');			
  var photo_layer = document.getElementById('big_photo');
 	   
  photo_layer.style.display = '';
  photo_layer.style.visibility = '';

  photo_layer.style.left = (self.innerWidth - photo_image.offsetWidth)/2 + 'px';
  photo_layer.style.top  = (self.innerHeight - photo_image.offsetHeight)/2 + 'px';  

}