if (document.images){

	what = new Image();
	what.src = "images/menu_what_a.gif";
	what_on = new Image();
	what_on.src = "images/menu_what_b.gif";
	
	using = new Image();
	using.src = "images/menu_using_a.gif";
	using_on = new Image();
	using_on.src = "images/menu_using_b.gif";
	
	docs = new Image();
	docs.src = "images/menu_docs_a.gif";
	docs_on = new Image();
	docs_on.src = "images/menu_docs_b.gif";
	
	join = new Image();
	join.src = "images/menu_join_a.gif";
	join_on = new Image();
	join_on.src = "images/menu_join_b.gif";
	
	contact = new Image();
	contact.src = "images/menu_contact_a.gif";
	contact_on = new Image();
	contact_on.src = "images/menu_contact_b.gif";
	
	glossary = new Image();
	glossary.src = "images/menu_glossary_a.gif";
	glossary_on = new Image();
	glossary_on.src = "images/menu_glossary_b.gif";
	
	qas = new Image();
	qas.src = "images/menu_qas_a.gif";
	qas_on = new Image();
	qas_on.src = "images/menu_qas_b.gif";
	
}

function on(name){
	if(document.images){
		document[name].src = eval(name + "_on.src");
	}
}

function off(name){
	if(document.images){
        document[name].src = eval(name + ".src");
	}
}