function _opacity(id, o) {
  var obj = document.getElementById(id).style;
  obj.MozOpacity = (o / 100); // Mozilla i FireFox
  obj.KhtmlOpacity = (o / 100); // Safari < 1.2
  obj.opacity = (o / 100); // Safari 1.2, nowszy FireFox i Mozilla
  obj.filter = "alpha(opacity=" + o + ")"; // Internet Explorer
}

//funkcja pokazuj?ca tresc konkretnego wpisu dla danego tematu
// iId - identyfikator wpisu



function getComment() {
	if(window.innerHeight)
		wys = window.innerHeight;
	else
		wys = document.body.clientHeight;
	
	_opacity('showTresc',80);
	$('showTresc').style.height = wys;
	new Ajax.Request('index.html?action=gn',{method: "get", onComplete: updateTrescDiv});
}

function updateTrescDiv(obj) {
	if(window.innerHeight)
		wys = window.innerHeight;
	else
		wys = document.body.clientHeight;
	
	$('showTresc').innerHTML = obj.responseText;
	$('showTresc').style.display = 'block';
	$('tresc').style.paddingTop = wys/2 - $('tresc').clientHeight/2;
	$('tresc').style.visibility = 'visible';	
}


function closeTresc() {
	$('showTresc').style.display = 'none';
}