function show(target_id){
	var web = document.getElementById("web");
	var webon = document.getElementById("webon");
	var weboff = document.getElementById("weboff");
	var photo = document.getElementById("photo");
	var photoon = document.getElementById("photoon");
	var photooff = document.getElementById("photooff");
	var art = document.getElementById("art");
	var arton = document.getElementById("arton");
	var artoff = document.getElementById("artoff");
	var cd = document.getElementById("cd");
	var cdon = document.getElementById("cdon");
	var cdoff = document.getElementById("cdoff");
	var cards = document.getElementById("cards");
	var cardson = document.getElementById("cardson");
	var cardsoff = document.getElementById("cardsoff");
	
	var target = document.getElementById(target_id);
	var targetOn = document.getElementById(target_id + 'on');
	var targetOff = document.getElementById(target_id + 'off');
	var sections = [art, web, photo, cd, cards];
	var on_images = [arton, webon, photoon, cdon, cardson];
	var off_images = [artoff, weboff, photooff, cdoff, cardsoff];
	
	for(var i = 0; i < sections.length; i++){
		if(sections[i] != target){
			sections[i].style.display = 'none';
			on_images[i].style.display = 'none';
			off_images[i].style.display = 'block';
		}
	}
	if (target.style.display == 'none') {
		target.style.display = 'block';
		targetOn.style.display = 'block';
		targetOff.style.display = 'none';
	} 
}