// Requires prototype.js
function edit(action, obj) {
	Element.hide(obj);
	var textarea ='<div id="' + obj.id + '_editor"><input type="text" id="' + obj.id + '_edit" name="' + obj.id + '" value="' + obj.innerHTML + '" size="40">';
	var button = '<input id="' + obj.id + '_save" type="button" value="SAVE" /> <input id="' + obj.id + '_cancel" type="button" value="CANCEL" /></div>';
	new Insertion.After(obj, textarea+button);
	Event.observe(obj.id+'_save', 'click', function(){saveChanges(action, obj)}, false);
	Event.observe(obj.id+'_cancel', 'click', function(){cleanUp(obj)}, false);
	$(obj.id+"_edit").focus();
	$(obj.id+"_edit").select();
}

function cleanUp(obj, keepEditable) {
	Element.remove(obj.id+'_editor');
	Element.show(obj);
	if(!keepEditable) showAsEditable(obj, true);
}

function saveChanges(action, obj) {
	var new_content = escape($F(obj.id+'_edit'));

	obj.innerHTML = "Saving...";
	cleanUp(obj, true);

	var success = function(t){editComplete(t, obj);}
	var failure = function(t){editFailed(t, obj);}

	var url = 'poll-ajax.php?a='+action;
	var pars = 'id=' + obj.id + '&content=' + new_content;
	var myAjax = new Ajax.Request(url, {method:'post', postBody:pars, onSuccess:success, onFailure:failure});
}

function editComplete(t, obj) {
	obj.innerHTML = t.responseText;
	showAsEditable(obj, true);
}

function editFailed(t, obj) {
	obj.innerHTML = 'Sorry, the update failed.';
	cleanUp(obj);
}

// Browser detection

// Internet Explorer
var ie  = document.all != null;  //ie4 and above
var ie5 = document.getElementById && document.all;
var ie6 = document.getElementById && document.all&&(navigator.appVersion.indexOf("MSIE 6.")>=0);

// Netscape
var ns4 = document.layers != null;
var ns6 = document.getElementById && !document.all;
var ns  = ns4 || ns6;

// Firefox
var ff  = !document.layers && !document.all;

// Opera
var op  = navigator.userAgent.indexOf("opera")>0;
var op7 = op && operaVersion() <= 7;
var op8 = op && operaVersion() >= 8;

// Detects the Opera version
function operaVersion() {
	agent = navigator.userAgent;
	idx = agent.indexOf("opera");	
	if (idx>-1) {
		return parseInt(agent.subString(idx+6,idx+7));
	}
}