// JavaScript Document
function layer_dis(layer_id,dis)
   {
   document.getElementById(layer_id).style.display=dis;
    }
	
function show(id) 
{ 

document.getElementById("cover").style.display = "block"; 
document.getElementById("tb_window").style.display = "block";
document.getElementById('img_show').src=id.src;
} 
function hidden() 
{ 
document.getElementById("cover").style.display = "none"; 
document.getElementById("tb_window").style.display = "none";

}