function $() {
	var results = [], element;
	for (var i = 0; i < arguments.length; i++) {
		element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		results.push((element));
	}
	return results.length < 2 ? results[0] : results;
}
js_showDescr = function( id ) {
	$( 'descr_' + id ).style.display = $( 'descr_' + id ).style.display == 'none' ? '' : 'none';
}

    var http_request = false;

    function makeRequest(url, func) {

        http_request = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/html');
                // See note below about this line
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
            return false;
        }
        http_request.onreadystatechange = func;
        http_request.open('POST', url, true);
        http_request.send(null);

    }