function make_request(source, params)
	{
	type = source.substr(source.length-3);
	var response="";
	new Ajax.Request(source, {
					method: 'post',
					parameters: params,
					asynchronous: false,
					onSuccess: function(transport) {
					switch(type)
						{
						case 'xml':
						response = transport.responseXML;
						break

						default:
						response = transport.responseText;
						break
						}
					}
	});
	return response;
	}

function change_pic(target, pic_source)
	{
	$(target).src=pic_source;
	}