function showhide(id) {
var el = document.getElementById(id);
	if (el != null) 
	{
	    var vedi = el.style.display;
		if ((vedi=='') || (vedi=='block'))
		{    el.style.display = 'none';}
        else
		{    el.style.display = 'block';}
	}
}
function show_hide(id, show) {
var el;
	if (el = document.getElementById(id)) {
		if (null==show) show = el.style.display=='none';
		el.style.display = (show ? '' : 'none');
	}
}
function showorhide(id, toggler) {
	if (document.getElementById(id).style.display == "none") {
		document.getElementById(id).style.display = "block";
		document.getElementById(toggler).innerHTML = "<img src=\"/img/toggle-close.gif\" alt=\"close\"/>";
	} else {
		document.getElementById(id).style.display = "none";
		document.getElementById(toggler).innerHTML = "<img src=\"/img/toggle-open.gif\" alt=\"open\"/>";
	}
}