function checkUncheckAll(theElement)
{
	var theForm = theElement.form, z = 0;
	for(z=0; z<theForm.length;z++)
	{
      	if(theForm[z].type == 'checkbox' && theForm[z].name != 'checkall')
		{
	  		theForm[z].checked = theElement.checked;
	  	}
     }
}

function createRequestObject()
{
	var request_;
	var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer")
	{
		request_ = new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		request_ = new XMLHttpRequest();
	}
	return request_;
}
		
var events_checker = new Array();
var hider = new Array();
var performVar = new Array();

function checkEvents()
{
	var curDateTime = new Date();
	events_checker[curDateTime] = createRequestObject();
	events_checker[curDateTime].open('get', 'js/checkEvents.php?cachepreventer=' + curDateTime);
	events_checker[curDateTime].send(null);
}

function hideNotify()
{
	var curDateTime = new Date();
	hider[curDateTime] = createRequestObject();
	hider[curDateTime].open('get', 'js/checkEvents.php?hide_notify=1&cachepreventer=' + curDateTime);
	hider[curDateTime].send(null);
	document.getElementById('performingBox').style.display = 'none';
}

function getAndPerform()
{
	var curDateTime = new Date();
	performVar[curDateTime] = createRequestObject();
			
	performVar[curDateTime].open('get', 'js/checkEvents.php?cachepreventer=' + curDateTime);
	performVar[curDateTime].onreadystatechange = function()
	{
		if (performVar[curDateTime].readyState == 4) 
		{
			if (performVar[curDateTime].status == 200 || performVar[curDateTime].status == 304) 
			{
				var response = performVar[curDateTime].responseText;
				if (response != '')
				{
					document.getElementById('performingBox').style.display = 'inline';
		 			document.getElementById('performingBox').innerHTML = response;
				} else {
					document.getElementById('performingBox').style.display = 'none';
				}
				// inviamo notifica di lettura...
				// tramite session()

        		}
		}
	}
	performVar[curDateTime].send(null);
}	
			
function ajax_check()
{
	checkEvents();
	getAndPerform();
	window.setTimeout("ajax_check()", 7000);
}	


function Browser() {

  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

function dragStart(event, id) {

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Save starting positions of cursor and element.

  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;

  // Update element's z-index.

  dragObj.elNode.style.zIndex = ++dragObj.zIndex;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
  }
}

function dragGo(event) {

  var x, y;

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    event.preventDefault();
}

function dragStop(event) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
}