function swapHeader( img ) {
	//document.getElementById('debug').innerHTML = "";
	//debug("swapping header with image "+img);
	
	var top = document.getElementById('header_table');
	var width = top.rows[0].cells[0].width + top.rows[0].cells[1].width;
	//debug("width: "+width);
	top.deleteRow(1);
	top.rows[0].deleteCell(0);
	top.rows[0].deleteCell(0);
	top.rows[0].cells[0].innerHTML = "<img src=\""+img+"\">";
	top.rows[0].cells[0].width = width;
}
function swapFooter( img ) {
	//document.getElementById('debug').innerHTML = "";
	//debug("swapping footer with image "+img);
	
	var top = document.getElementById('footer_table');
	var width = bottom.rows[0].cells[0].width + bottom.rows[0].cells[1].width;
	//debug("width: "+width);
	top.deleteRow(1);
	top.rows[0].deleteCell(0);
	top.rows[0].deleteCell(0);
	top.rows[0].cells[0].innerHTML = "<img src=\""+img+"\">";
	top.rows[0].cells[0].width = width;
}
function debug( m ) {
	br = document.createElement("br");
	d = document.getElementById('debug');
	d.innerHTML += m + br.innerHTML;
}

function setImage(src) {
source_image = document.getElementById(src);
target_image = document.getElementById('large_image');
target_image.src = source_image.src;	
}

// from http://javascript-array.com/scripts/simple_drop_down_menu/
// Copyright 2006-2007 javascript-array.com

var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;