function show_large_image(image)
{
	surrounding_black= document.getElementById('show_big_image_div_surrounding');
	surrounding_black.style.display="block";

  	document.getElementById('big_image').src=image;		

	document.getElementById('show_big_image_div').style.display="block";

}
function hide_large_image()
{
  	document.getElementById('big_image').src='';	
	document.getElementById('show_big_image_div_surrounding').style.display="none";
	document.getElementById('show_big_image_div').style.display="none";  
}