function shownhide(id) {
	//alert("shownhide ["+id+"]");
	if(document.getElementById){
		if (document.getElementById(id).style.display == "block"){
			document.getElementById(id).style.display = "none";
		}else{
			if (document.getElementById(id).style.display == "none"){
				document.getElementById(id).style.display = "block";
			}
		}
	}
}