var sub_menu_recentsuccesses_off = "images/sub_menu_recentsuccesses_off.gif";
var sub_menu_recentsuccesses_on = "images/sub_menu_recentsuccesses_on.gif";
var sub_menu_about_off = "images/sub_menu_about_off.gif";
var sub_menu_about_on = "images/sub_menu_about_on.gif";
var sub_menu_contact_off = "images/sub_menu_contact_off.gif";
var sub_menu_contact_on = "images/sub_menu_contact_on.gif";
var sub_menu_home_off = "images/sub_menu_home_off.gif";
var sub_menu_home_on = "images/sub_menu_home_on.gif";
var sub_menu_practice_off = "images/sub_menu_practice_off.gif";
var sub_menu_practice_on = "images/sub_menu_practice_on.gif";

function activate(imgName) {
	document.images[imgName].src = eval( imgName + "_on" );
}

function deactivate(imgName) {
	document.images[imgName].src = eval( imgName + "_off" );
}