// swapImage
function swapImage(id, src){
	eval('document.' + id + '.src = "' + src + '"');
}

// show
function show(id) {
	if(document.getElementById) {
		document.getElementById(id).style.visibility = "visible";
	}
}

// hide
function hide(id) {
	if(document.getElementById) {
		document.getElementById(id).style.visibility = "hidden";
	}
}

// switchVisibility
function switchVisibility(id) {
	if(document.getElementById(id).style.visibility == "hidden") {
		show(id);
	}
	else {
		hide(id);
	}
}

// popup
function popup(url, name, width, height) {
	window.open(url, name, 'width='+width+', height='+height+', resizable=no, location=no, menubar=no, toolbar=no, scrollbars=no, dependent=yes');
}