function toggleImg(imgName) {
	var tmp, mlay, img;
	img = document.images[imgName];
	if( img && img.lowsrc ) { tmp = img.src; img.src = img.lowsrc; img.lowsrc = tmp }
	if( tmp = eval('document.all.lay' + imgName) ) {
		mlay = eval('document.all.laydomain');
		if( mlay.style.visibility == 'visible' ) {
			mlay.style.visibility = 'hidden' ;
			tmp.style.visibility = 'visible';
		} else {
			tmp.style.visibility = 'hidden' ;
			mlay.style.visibility = 'visible';
		}
	}
}

function hideLayer(layName) {
	if( tmp = eval('document.all.' + layName) ) tmp.style.visibility = 'hidden';
}

function showLayer(layName) {
	if( tmp = eval('document.all.' + layName) ) tmp.style.visibility = 'visible';
}