function showHide(id,mydisplay) {

	if (mydisplay == '') var mydisplay = 'block';
	if(document.getElementById(id) && document.getElementById(id).style.display == "none") {
		document.getElementById(id).style.display = mydisplay;
		return;
	}
	if(document.getElementById(id) && document.getElementById(id).style.display == mydisplay) {
		document.getElementById(id).style.display = "none";
		return;
	}
}