function Button(off,on) { this.off = new Image(); this.off.src = off; this.on = new Image(); this.on.src = on; }
function turnon(thisbutton) { if (document.images) document [thisbutton].src = eval(thisbutton+".on.src"); }
function turnoff(thisbutton) { if (document.images) document [thisbutton].src = eval(thisbutton+".off.src"); }

if (document.images)
{
	menumain = new Button("images/menu/main.gif", "images/menu/main_b.gif");
	menunews = new Button("images/menu/news.gif", "images/menu/news_b.gif");
	menuhg = new Button("images/menu/helsinkigroup.gif", "images/menu/helsinkigroup_b.gif");
	menutg = new Button("images/menu/trackgroups.gif", "images/menu/trackgroups_b.gif");
	menutg1 = new Button("images/menu/networksinstitutions.gif", "images/menu/networksinstitutions_b.gif");
	menutg2 = new Button("images/menu/financedevelopment.gif", "images/menu/financedevelopment_b.gif");
	menutg3 = new Button("images/menu/humansecurity.gif", "images/menu/humansecurity_b.gif");
	menuproceedings = new Button("images/menu/proceedings.gif", "images/menu/proceedings_b.gif");
	menuagenda = new Button("images/menu/events.gif", "images/menu/events_b.gif");
	menuparticipants = new Button("images/menu/participants.gif", "images/menu/participants_b.gif");
	menulocations = new Button("images/menu/locations.gif", "images/menu/locations_b.gif");
	menumaterials = new Button("images/menu/documents.gif", "images/menu/documents_b.gif");
	menupress = new Button("images/menu/press.gif", "images/menu/press_b.gif");
	menulinks = new Button("images/menu/links.gif", "images/menu/links_b.gif");
	menucontacts = new Button("images/menu/contacts.gif", "images/menu/contacts_b.gif");
	menuindex = new Button("images/menu/siteindex.gif", "images/menu/siteindex_b.gif");
}