function rollover(img){
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + img + '_on.jpg';
}

function rollout(img){
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + img + '_off.jpg';
}

function web_rollover(img){
	var image = img.split('_');
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + image[0] + '_on.jpg';
}

function web_rollout(img){
	var image = img.split('_');
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + image[0] + '_off.jpg';
}

function sub_rollover(img){
	var obj = document.getElementById(img);
	
	obj.src = 'images/submenu/' + img + '_on.jpg';
}

function sub_rollout(img){
	var obj = document.getElementById(img);
	
	obj.src = 'images/submenu/' + img + '_off.jpg';
}

function show_menu(div){
	var main_menu = document.getElementById('submenu');
	var obj = document.getElementById(div);
	
	main_menu.style.display = 'block';
	obj.style.display = 'block';
}

function hide_menu(div){
	var main_menu = document.getElementById('submenu');
	var obj = document.getElementById(div);
	
	main_menu.style.display = 'none';
	obj.style.display = 'none';
}