function showhide(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		if (obj.style.display == "none"){
			obj.style.display = "";
		} else {
			obj.style.display = "none";
		}
	}
} 

function changeOpenCloseImg(id, pic1, pic2) {
	var el = document.getElementById(id);
	var pic=((el.src.match(pic1)!=null)? pic2 : pic1);
	el.src="images/"+pic+".gif";
}