function toggleLayer(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display? "":"block";
}
else if (document.all)
{
// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display? "":"block";
}
else if (document.layers)
{
// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display? "":"block";
}
}
//
//
function toggleBG(obj) {
	var el = document.getElementById(obj);
	if ( el.rel != 'open' ) {
		el.style.background = 'url(img/icon_minus.gif) top left no-repeat';
		el.rel = 'open';
	}
	else {
		el.style.background = 'url(img/icon_plus.gif) top left no-repeat';
		el.rel = 'closed';
	}
}