var current_tab = 1;

function showTab(id)
{
	var tab		= document.getElementById ("tab" + id);
	var ctab	= document.getElementById ("tab" + current_tab);

	switch (current_tab)
	{
		case 1 :
			ctab.className = 'design';
			break;
		case 2 :
			ctab.className = 'details';
			break;
		case 3 :
			ctab.className = 'story';
			break;
		case 4 :
			ctab.className = 'matching';
			break;
	}

	var frame			= document.getElementById ("item-frame-" + current_tab);
	frame.style.display = "none";

	tab.className		= tab.className + " active";
	current_tab			= id;

	var frame			= document.getElementById ("item-frame-" + current_tab);
	frame.style.display = "block";
}