// JavaScript Document
if (document.images) {
	nav_home_on = new Image();      
	nav_home_on.src = "images/nav_home_on.gif";
	nav_home_off = new Image();      
	nav_home_off.src = "images/nav_home_off.gif";
	
	nav_oursites_on = new Image();      
	nav_oursites_on.src = "images/nav_oursites_on.gif";
	nav_oursites_off = new Image();      
	nav_oursites_off.src = "images/nav_oursites_off.gif";
	
	nav_whatson_on = new Image();      
	nav_whatson_on.src = "images/nav_whatson_on.gif";
	nav_whatson_off = new Image();      
	nav_whatson_off.src = "images/nav_whatson_off.gif";
	
	nav_register_on = new Image();      
	nav_register_on.src = "images/nav_register_on.gif";
	nav_register_off = new Image();      
	nav_register_off.src = "images/nav_register_off.gif";	
	
	nav_exhibitions_on = new Image();      
	nav_exhibitions_on.src = "images/nav_exhibitions_on.gif";
	nav_exhibitions_off = new Image();      
	nav_exhibitions_off.src = "images/nav_exhibitions_off.gif";
	
	nav_history_on = new Image();      
	nav_history_on.src = "images/nav_history_on.gif";
	nav_history_off = new Image();      
	nav_history_off.src = "images/nav_history_off.gif";
	
	nav_museumcoll_on = new Image();      
	nav_museumcoll_on.src = "images/nav_museumcoll_on.gif";
	nav_museumcoll_off = new Image();      
	nav_museumcoll_off.src = "images/nav_museumcoll_off.gif";
	
	nav_learning_on = new Image();      
	nav_learning_on.src = "images/nav_learning_on.gif";
	nav_learning_off = new Image();      
	nav_learning_off.src = "images/nav_learning_off.gif";
	
	register_button_on = new Image();      
	register_button_on.src = "images/register_button_on.gif";
	register_button_off = new Image();      
	register_button_off.src = "images/register_button_off.gif";
	
	question_button_on = new Image();      
	question_button_on.src = "images/question_button_on.gif";
	question_button_off = new Image();      
	question_button_off.src = "images/question_button_off.gif";
	
	submit_button_on = new Image();      
	submit_button_on.src = "images/submit_deatails_but_on.gif";
	submit_button_off = new Image();      
	submit_button_off.src = "images/submit_deatails_but_off.gif";
}

function turnOn(id) {
	document.getElementById(id).src = eval(id + "_on.src");
}

function turnOff(id) {
	document.getElementById(id).src = eval(id + "_off.src");
}

function side_rollover(id) {
	document.getElementById(id).className = "side_item_on";
}

function side_rolloff(id) {
	document.getElementById(id).className = "side_item";
}

function validateEnquiry()
{
	var emailField = document.forma.email;
	
	if (!emailField.value)
	{
		alert('Please fill in your e-mail address');
		return false;
	}
	
	return true;
}