function show_cat(catid) {

	max_cat = 3;
	for (cat = 1; cat <= max_cat; cat++) {
		document.getElementById("cat_" + cat).style.display = (cat == catid ? "block" : "none");
	}

}




function show_simple_search() {

	// if one of the search boxes is already open, close it
	// else open the simple search query box...		

	if (document.getElementById("simple_search").style.display == "block") {
		document.getElementById("simple_search").style.display = "none";
	} else {
		document.getElementById("simple_search").style.display = "block";
	}

}