function z_slideshow(){
	if(document.getElementById('slideshow_on').style.display == "")	{
		document.getElementById('icon_link').style.display = "none";
		document.getElementById('icon').style.display = "";
		document.getElementById('slideshow_on').style.display = "none";
		document.getElementById('slideshow_off').style.display = "";
	}else{
		document.getElementById('icon_link').style.display = "";
		document.getElementById('icon').style.display = "none";
		document.getElementById('slideshow_on').style.display = "";
		document.getElementById('slideshow_off').style.display = "none";
	}
}