// JavaScript Document
function changeTab(tab) {
	
	var path = "/images/";
	//tabs 
	var tab1 = document.getElementById("tab1");
	var tab2 = document.getElementById("tab2");
	var tab3 = document.getElementById("tab3");
	
	//boxes
	var box1 = document.getElementById("box1");
	var box2 = document.getElementById("box2");
	var box3 = document.getElementById("box3");
	
	if (tab == 'tab1') {
		
		tab2.src = path + "btn_artspan_directories_off.gif";
		tab3.src = path + "btn_other_art_sites_off.gif";
		box1.style.display = "block";
		box2.style.display = "none";
		box3.style.display = "none";
		
	}
	if (tab == 'tab2') {
		
		tab1.src = path + "btn_artspan_sites_off.gif";
		tab3.src = path + "btn_other_art_sites_off.gif";
		box1.style.display = "none";
		box2.style.display = "block";
		box3.style.display = "none";
		
	}
	if (tab == 'tab3') {
		
		tab1.src = path + "btn_artspan_sites_off.gif";
		tab2.src = path + "btn_artspan_directories_off.gif";
		box1.style.display = "none";
		box2.style.display = "none";
		box3.style.display = "block";
		
	}
}