function hide_manuf()
{
	var cat_sel = document.advsearch.adv_cat;
	
	for (var i = 0; i < cat_sel.options.length; i++)
	{
		var t_sel = document.getElementById("manufId" + cat_sel.options[i].value); 
		t_sel.style.display = "none";
	}
	
}

function show_manuf(selected)
{
	hide_manuf();
	var t_sel = document.getElementById("manufId" + selected); 
	t_sel.style.display = "inline";
	
	document.advsearch.action = "index.php?categoryid=" + selected;
}