function show_overlay(overlayid,overlayheight) {
	document.getElementById("overlay_00").style.display = 'block';
	document.getElementById("overlay_00").style.height = overlayheight;
	document.getElementById(overlayid).style.display = 'block';
	return false;
}

function hide_overlay(overlayid) {
	document.getElementById("overlay_00").style.display = 'none';
	document.getElementById(overlayid).style.display = 'none';
	return false;
}