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, "");
}

inWin = null;
function openwindow(strona,width,height) {
    if (navigator.appName == "Microsoft Internet Explorer") {
        inWin = window.open(String(strona), 'inWin', "toolbar=no,menubar=no,scrollbars=no,resizable=yes,status=no,location=no,directories=no,fullscreen=no,titlebar=no,width=" + String(width) + ",height=" + String(height));
    } else {
        inWin = window.open(String(strona), 'inWin', "toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,innerWidth=" + String(width) + ",innerHeight=" + String(height));
    }
    inWin.focus();
}

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 wyslijZnajomemu(article, lang) {
    openwindow('http://www.confero.pl/sendToFriend1.php/'+lang+'/'+article,330,180);
}

function urlencode(s) {
    var hexDigit = '0123456789ABCDEF';
    var ns = '';
    var z = '';
    s = String(s);
    for(i=0;i<s.length;i++) {
        z = UNICODEtoISO(s.charCodeAt(i));
        if ((z>=97 && z<=122) || (z>=65 && z <= 90) || (z>=48 && z <= 57)) {
            ns += s.charAt(i);
        } else {
            ns += '%'+hexDigit.charAt((z&0xF0)>>>4)+hexDigit.charAt(z&0x0F);
        }
    }
    return ns;
}
/* Converts polish characters from UNICODE to ISO-8859-2 */
function UNICODEtoISO(code) {
    var uCode = [261,260,281,280,243,211,347,346,322,321,380,379,378,377,263,262,324,323];
    var iCode = [177,161,234,202,243,211,182,166,179,163,191,175,188,172,230,198,241,209];
    var i = iCode.length-1;
    while(i>=0) {
        if (uCode[i]==code) {
            return iCode[i];
        }
        i--;
    }
    return code;
}

function openInWindow2(_url,_width, _height) {
    if (_width<1) { _width = 300; }
    if (_height<1) { _height = 300; }
    window.open(_url,'','status=no,width='+(_width+20)+',height='+(_height+20)+',screenX=50,screenY=50,left=50,top=50,resizable=1,scrollbars=auto');
}