var prev_id = 0;
var last_id = 0;
var current_picture_fname = "";
var current_picture_width = -1;
var current_picture_height = -1;
var current_picture_text = "";
var activated_picture = 0;

	function replace_picture(img_id,fname)
	{
		var picture = document.getElementById(img_id);

		if (picture) {
			picture.src = fname;
		}
	}

	function switch_class(id)
	{
		var cl = document.getElementById("thumb_" + id);

		if (cl) {
			if (cl.className == "image_select") {
				cl.className = "image_deselect";
			}
			else if (cl.className == "image_deselect") {
				cl.className = "image_select";
			}
		}
	}

	function set_alt_text(alt)
	{
		var span_alt = document.getElementById("large_alt");

		if (span_alt) {
			span_alt.innerHTML = alt;
		}
	}

	function over_picture(id,cur_top,cur_bottom)
	{
		if ((id) || (id == "0")) {
			if (prev_id >= 0) {
				switch_class(prev_id);

				// replace_picture("cur_top_" + prev_id,"imgs/empty.gif");
				replace_picture("cur_bottom_" + prev_id,"imgs/empty.gif");
			}

			if (cur_top) {
				// replace_picture("cur_top_" + id,cur_top);
			}
			if (cur_bottom) {
				replace_picture("cur_bottom_" + id,cur_bottom);
			}

			prev_id = id;
		}
	}

	function out_picture(cur_top,cur_bottom)
	{
		return over_picture(last_id,cur_top,cur_bottom);
	}

	function set_picture(fname,id,cur_top,cur_bottom,img_alt,large_fname,large_w,large_h)
	{
		replace_picture("large_picture",fname);

		if (large_fname != "") {
			current_picture_fname  = large_fname;
			current_picture_width  = large_w;
			current_picture_height = large_h;
		}
		else {
			current_picture_fname = fname;
		}
		current_picture_text = img_alt;

		if ((id) || (id == "0")) {
			set_alt_text(img_alt);

			switch_class(id);

			if (last_id >= 0) {
				replace_picture("cur_top_" + last_id,"imgs/empty.gif");
			}
			if (prev_id >= 0) {
				switch_class(prev_id);

				// replace_picture("cur_top_" + prev_id,"imgs/empty.gif");
				replace_picture("cur_bottom_" + prev_id,"imgs/empty.gif");
			}

			if (cur_top) {
				replace_picture("cur_top_" + id,cur_top);
			}
			if (cur_bottom) {
				replace_picture("cur_bottom_" + id,cur_bottom);
			}

			prev_id = id;
			last_id = id;
		}

		return 0 == 1;
	}

	function zoom_picture(fname,w,h)
	{
		fn = fname;
		w2 = w;
		h2 = h;
		if (current_picture_fname != "") {
			fn = current_picture_fname;
		}
		if (current_picture_width >= 0) {
			w2 = current_picture_width;
		}
		if (current_picture_height >= 0) {
			h2 = current_picture_height;
		}

		url  = "http://www.nashuaone.com/cgi-bin/zoom.cgi";
		url += "?image=" + escape(fn);
		url += "&width=" + w2;
		url += "&height=" + h2;

		options  = "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no, resizable=no"; 
		options += ",width=" + w2;
		options += ",height=" + h2;

		window.open(url,"_blank",options);

		return false;
	}