function showpic(whichpic){
   var source=whichpic.getAttribute("name");
   var placeholder=document.getElementById("placeholder");
   placeholder.setAttribute("src",source);
}
function show(){
	this.checked=!this.checked;document.getElementById('Child').style.display=(this.checked)?'block':'none';
	var item=document.getElementById("item");
	item.className=(item.className=="item"?"item_a":"item")				   
}

function show_a(){
	this.checked=!this.checked;document.getElementById('Child_a').style.display=(this.checked)?'block':'none';
	var item=document.getElementById("item_a");
	item.className=(item.className=="item"?"item_a":"item")				   
}
function show_b(){
	this.checked=!this.checked;document.getElementById('Child_b').style.display=(this.checked)?'block':'none';
	var item=document.getElementById("item_b");
	item.className=(item.className=="item"?"item_a":"item")				   
}