var current_preview_zindex = 99;
var popup_timeout = false;

function show_overview_item_hover (id, popup) {
	
	// Hover
	var src = $("#"+id+" .overview_item").attr("src");
	
	if (src) {
		
		new_src = src.replace(".", "_hover.");
		$("#"+id+" .overview_item").attr("src", new_src); 
	}
	
	// Popup
	if (popup !== false) {
		
		var f = function() { show_overview_popup(id); };
		popup_timeout = setTimeout(f, 500);		
	}
}

function show_overview_popup (id) {
	
	var hover_id = id + "_hover";
	var new_zindex = current_preview_zindex++;
	$("#"+id+" .item_container").css("zIndex", new_zindex);
	document.getElementById(hover_id).style.visibility = "visible";	
}