fValidVer =
  (((navigator.appName == "Netscape") &&
  (parseInt(navigator.appVersion) >= 3 )) ||
  ((navigator.appName == "Microsoft Internet Explorer") &&
  (parseInt(navigator.appVersion) >= 4 )));

if (document.images) {
	var general_normal = new Image;
	general_normal.src = "buttons/general_normal_button.gif";

	var general_hover = new Image;
	general_hover.src = "buttons/general_hover_button.gif";

	var general_click = new Image;
	general_click.src = "buttons/general_click_button.gif";

	var history_normal = new Image;
	history_normal.src = "buttons/history_normal_button.gif";

	var history_hover = new Image;
	history_hover.src = "buttons/history_hover_button.gif";

	var history_click = new Image;
	history_click.src = "buttons/history_click_button.gif";

	var data_normal = new Image;
	data_normal.src = "buttons/data_normal_button.gif";

	var data_hover = new Image;
	data_hover.src = "buttons/data_hover_button.gif";

	var data_click = new Image;
	data_click.src = "buttons/data_click_button.gif";

	var anthem_normal = new Image;
	anthem_normal.src = "buttons/anthem_normal_button.gif";

	var anthem_hover = new Image;
	anthem_hover.src = "buttons/anthem_hover_button.gif";

	var anthem_click = new Image;
	anthem_click.src = "buttons/anthem_click_button.gif";

	var other_normal = new Image;
	other_normal.src = "buttons/other_normal_button.gif";

	var other_hover = new Image;
	other_hover.src = "buttons/other_hover_button.gif";

	var other_click = new Image;
	other_click.src = "buttons/other_click_button.gif";

	var surindex_normal = new Image;
	surindex_normal.src = "buttons/surindex_normal_button.gif";

	var surindex_hover = new Image;
	surindex_hover.src = "buttons/surindex_hover_button.gif";

	var surindex_click = new Image;
	surindex_click.src = "buttons/surindex_click_button.gif";

	var surilinks_normal = new Image;
	surilinks_normal.src = "buttons/surilinks_normal_button.gif";

	var surilinks_hover = new Image;
	surilinks_hover.src = "buttons/surilinks_hover_button.gif";

	var surilinks_click = new Image;
	surilinks_click.src = "buttons/surilinks_click_button.gif";

	var suripics_normal = new Image;
	suripics_normal.src = "buttons/suripics_normal_button.jpg";

	var suripics_hover = new Image;
	suripics_hover.src = "buttons/suripics_hover_button.jpg";

	var suripics_click = new Image;
	suripics_click.src = "buttons/suripics_click_button.jpg";
		
	var peter_normal = new Image;
	peter_normal.src = "buttons/peter_normal_button.gif";

	var peter_hover = new Image;
	peter_hover.src = "buttons/peter_hover_button.gif";

	var peter_click = new Image;
	peter_click.src = "buttons/peter_click_button.gif";

	var survey_normal = new Image;
	survey_normal.src = "buttons/survey_normal_button.gif";

	var survey_hover = new Image;
	survey_hover.src = "buttons/survey_hover_button.gif";

	var survey_click = new Image;
	survey_click.src = "buttons/survey_click_button.gif";

	var troon_normal = new Image;
	troon_normal.src = "buttons/troon_normal_button.gif";

	var troon_hover = new Image;
	troon_hover.src = "buttons/troon_hover_button.gif";

	var troon_click = new Image;
	troon_click.src = "buttons/troon_click_button.gif";        

	var geo_normal = new Image;
	geo_normal.src = "buttons/geo_normal_button.gif";

	var geo_hover = new Image;
	geo_hover.src = "buttons/geo_hover_button.gif";

	var geo_click = new Image;
	geo_click.src = "buttons/geo_click_button.gif";

	var nl_normal = new Image;
	nl_normal.src = "buttons/nl_normal_button.jpg";

	var nl_hover = new Image;
	nl_hover.src = "buttons/nl_hover_button.jpg";

	var nl_click = new Image;
	nl_click.src = "buttons/nl_click_button.jpg";
}

function Swap(image1, image2) {
  if (document.images)
  	document.images[image1].src = eval(image2 + ".src");
}