function openInWindow(_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');
}

function openTest(numer) {
    openInWindow('http://www.hards.pl/old/tester/index.php?test_id='+numer,700, 500);
}

function htmlspecialchars(s) {
    s = String(s);
    if (s.length==0) { return s; }
    s = s.replace(/&/,'&amp;');
    s = s.replace(/</,'&lt;');
    s = s.replace(/>/,'&gt;');
    s = s.replace(/"/,'&quot;');
    return s;
}

function ehtmlspecialchars(s) {
    s = String(s);
    if (s.length==0) { return s; }
    s = s.replace(/&/,'&amp;');
    s = s.replace(/</,'&lt;');
    s = s.replace(/>/,'&gt;');
    s = s.replace(/"/,'&quot;');
    s = s.replace(/&lt;[bB]&gt;/,'<b>');
    s = s.replace(/&lt;\/[bB]&gt;/,'</b>');
    s = s.replace(/&lt;[iI]&gt;/,'<i>');
    s = s.replace(/&lt;\/[iI]&gt;/,'</i>');
    s = s.replace(/&lt;[sS][uU][pP]&gt;/,'<sup>');
    s = s.replace(/&lt;\/[sS][uU][pP]&gt;/,'</sup>');
    return s;
}

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;
}