function hide_tab(tab)
{
	var my_tab = document.getElementById("year" + tab + "-data");
	my_tab.className = 'gallery-data hidden';

	var tab_header = document.getElementById("year" + tab + "-show");
	tab_header.className = 'gallery-caption';

	var tab_header = document.getElementById("year" + tab + "-hide");
	tab_header.className = 'gallery-caption hidden';
}

function show_tab(tab)
{
	var my_tab = document.getElementById("year" + tab + "-data");
	my_tab.className = 'gallery-data';

	var tab_header = document.getElementById("year" + tab + "-show");
	tab_header.className = 'gallery-caption hidden';

	var tab_header = document.getElementById("year" + tab + "-hide");
	tab_header.className = 'gallery-caption';
}

//object-distinct functions
function show_galleries_tab(tab, others)
{
	//hide all tabs first

	var other_tab;
	for (other_tab in arguments) {
		alert(other_tab);
		hide_tab(other_tab)
	}

	show_tab(tab);
}