function showDiv(){
	var status = document.getElementById("div3").style.display;
	document.getElementById("div3").style.display = 'none';
	document.getElementById("img3").className = 'black12bg';
	if (status == "none") {
		document.getElementById("div3").style.display = '';
		document.getElementById("img3").className = "black12bg_minus"
	}
}