function swappic(picname)
{
	var picbase = 'images/photos/';
	document.getElementById('mainpic').src = document.getElementById(picname).src.replace(picbase,picbase+'lg1/');
	document.getElementById('mainpiclink').href = 'largeimage.aspx?img=' + document.getElementById(picname).src.replace(picbase,picbase+'lg2/');

}