function toggleVisibility(id, NNtype, IEtype, WC3type) {
	if (document.getElementById) {
		eval("document.getElementById(id).style.visibility = \"" + WC3type + "\"");
	} else {
		if (document.layers) {
			document.layers[id].visibility = NNtype;
		} else {
			if (document.all) {
				eval("document.all." + id + ".style.visibility = \"" + IEtype + "\"");
			}
		}
	}
}


function hide_maindivs(){
  toggleVisibility('mainpic','hidden','hidden','hidden');
  toggleVisibility('blurb','hidden','hidden','hidden');
  toggleVisibility('statement','hidden','hidden','hidden');
  toggleVisibility('credits','hidden','hidden','hidden');
  toggleVisibility('hardware','hidden','hidden','hidden');
  toggleVisibility('software','hidden','hidden','hidden');
}