function isEmailValid(emailstring) {
	if (!emailstring.match(/^[a-z0-9+]{1}[a-z_0-9-\.]*@[a-z0-9]{1}[a-z0-9-]*(\.[a-z0-9]{1}[a-z0-9-]*)+$/gi)) {
		return false;
	}
	return true;
}

function jstrim(s) {
    return s.replace(/(^\s+)|(\s+$)/g, "");
}

function open_popup(_url,_width, _height) {
    if (_width<1) { _width = 300; }
    if (_height<1) { _height = 300; }
    window.open(_url,'popupwin','status=no,width='+(_width+20)+',height='+(_height+20)+',screenX=50,screenY=50,left=50,top=50,scrollbars=yes,resizable=yes');
}

function popup_grafika(_id, _width, _height, _abs, _lg) {
    if (_width<1) { _width = 300; }
    if (_height<1) { _height = 300; }
    window.open(_abs+'popup_grafika.php/'+_lg+'/popup/'+_id,'','status=no,width='+(_width+40)+',height='+(_height+40)+',screenX=50,screenY=50,left=50,top=50,scrollbars=no,resizable=yes');
}

function openwindow(strona,width,height) {
}


function wyslijZnajomemu(_abs, article, lang) {
    var strona = _abs+'sendToFriend1.php/'+lang+'/'+article;
    var width = 330;
    var height = 180;
    var wzwin = null;
    if (navigator.appName == "Microsoft Internet Explorer") {
        wzwin = window.open(String(strona), 'wzWin', "toolbar=no,menubar=no,scrollbars=auto,resizable=yes,status=no,location=no,directories=no,fullscreen=no,titlebar=no,width=" + String(width) + ",height=" + String(height));
    } else {
        wzwin = window.open(String(strona), 'wzWin', "toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,innerWidth=" + String(width) + ",innerHeight=" + String(height));
    }
    wzwin.focus();
}