/*** Inizializzazione browser (old-style) ***/

var iexplorer = 0;
var ie55 = 0; //particolare per versione 5.5 di explorer
var mozilla = 0; //netscape incluso
var opera = 0;

if (navigator.userAgent.indexOf("Opera")>=0) { opera = 1; }
else
 if (navigator.userAgent.indexOf("MSIE")>=0) { 
     iexplorer = 1; 
     if (navigator.appVersion.indexOf("MSIE 5.5")>=0) { ie55 = 1; }
 } else
    if (navigator.userAgent.indexOf("Mozilla")>=0) { mozilla = 1; }
    else {
    //tentativo di riconoscere browser explorer o netscape "like"
    iexplorer=document.all&&document.getElementById
    mozilla=document.getElementById&&!document.all
   }

//Retrocompatibilità AVNG
var ie5 = iexplorer;
var ns6 = mozilla;

/*** Fine inizializzazione browser ***/

/* Funzioni di utilità */

function SetBoxPosition(box, leftedge, topedge, offsetx, offsety, bordersmargin) {
   if (!offsetx) var offsetx = 0;
   if (!offsety) var offsety = 0;
   if (!bordersmargin) var bordersmargin = 0;

   var boxwidth = box.offsetWidth;
   var boxheight = box.offsetHeight;

   var rightend = GetInnerWidth() + GetScrollXPosition() - bordersmargin;
   var bottomend = GetInnerHeight() + GetScrollYPosition() - bordersmargin;
   var leftedgetorightend = rightend - (leftedge + offsetx);
   var topedgetobottomend = bottomend - (topedge + offsety);

   //if the horizontal distance isn't enough to accomodate the width of the box
   if ( leftedgetorightend < boxwidth) {
       box.style.left = leftedge - boxwidth + "px"
   }
   else if ((leftedge + offsetx) < (bordersmargin)) {
       box.style.left= bordersmargin + "px";
   } else {
       //"Usual" horizontal position of the box
       box.style.left= leftedge + offsetx + "px"
   }



   //same concept with the vertical position
   if ( topedgetobottomend < boxheight) {
       box.style.top = topedge - offsety - boxheight + "px"
   }
   else if ((topedge + offsety) < (bordersmargin)) {
       box.style.top= bordersmargin + "px"
   } else {
       //"Usual" vertical position of the box
       box.style.top = topedge + offsety +"px"   
   }
}

//Dato un evento ne rileva la posizione e poisiziona un oggetto (box)
function SetBoxPositionOnEvent(e, box, offsetx, offsety, bordersmargin) {
   var leftedge = GetClientXPosition(e) + GetScrollXPosition();
   var topedge  = GetClientYPosition(e) + GetScrollYPosition();
   return SetBoxPosition(box, leftedge, topedge, offsetx, offsety, bordersmargin)
}

//Restituisce la posizione assoluta di un elemento nella pagina
function GetElementXPosition(el) {
   if (el.offsetLeft == 0)
       return 0
   else
       return el.offsetLeft+GetElementXPosition(el.offsetParent)
}

function GetElementYPosition(el) {
   if (el.offsetTop == 0)
       return 0
   else
       return el.offsetTop+GetElementYPosition(el.offsetParent)
}

/*
    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com
*/

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && document.all)? document.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}

/* Show a table-row by row prefix, num, till max rows number reached */
function show_row(prefix, num, max) {
   if ((max)&&(num<max)) {
      GetElementById(prefix+num).style.display = 'table-row';
   }
   else {
      alert('Numero massimo di righe raggiunto');
   }
}

/* Which of the radio button is checked ? */
var whichischecked = new Function("els", "var l = els.length; if (l) for (i=0; i<l; i++) { if (els[i].checked) return els[i] } else if (els.checked) return els;");

/* Expand or reduce simple tree node */
function expand_or_reduce_treenode(e) {
   var el = GetFiringObj(e);
   var subel = el.parentNode.lastChild;

   if (el.getAttribute("src")==el.getAttribute("exp_src")) { 
      el.setAttribute("src", el.getAttribute("red_src")); 
      el.setAttribute("alt", el.getAttribute("red_alt")); 
      subel.style.display="block";
      subel.style.margin="5px 0 0 15px";
   } else { 
      el.setAttribute("src", el.getAttribute("exp_src")); 
      el.setAttribute("alt", el.getAttribute("exp_alt")); 
      subel.style.display="none";
   }
}

function expand_or_reduce_treenode_by_url(e, url, query_string) {
   var el = GetFiringObj(e);
   var subel = el.parentNode.lastChild;
   if (!subel.getAttribute("has_been_expanded")) {
      SetInnerHTMLbyUrl(subel, url, query_string)
      subel.setAttribute("has_been_expanded",1)
   }
   return expand_or_reduce_treenode(e)
}

function get_child_by_tag(el, tagName) {
    /* Get child element by tag */
    var child = el.firstChild;
    var tmp_el ;
    while ((child)&&(child.tagName != tagName)) {
       tmp_el = child.firstChild;
       if (tmp_el) {
           child = tmp_el;
       } else {
           tmp_el = child.nextSibling;
           if (tmp_el) {
              child = tmp_el;
           } else {
              tmp_el = child.parentNode;
              while (tmp_el != el)
                 if (tmp_el.nextSibling) {
                    child = tmp_el.nextSibling;
                    break;
                 } else 
                    tmp_el = tmp_el.parentNode;
              if (tmp_el == el) 
                 return;
           }
       }
    }
    return child;
}

/* Manage query string (inspired by http://www.eggheadcafe.com/articles/20020107.asp) */

function PageQuery(q) {
   if (q && q.length > 1) 
      q = q.substring(1, q.length);
   else 
      q = null;

   this.keyValuePairs = new Object();
   if(q) {
     var key_value = new Array();
     for(var i=0; i < q.split("&").length; i++) {
        key_value = q.split("&")[i].split("=");
        this.keyValuePairs[key_value[0]] = key_value[1];
     }
   }

   this.getKeyValuePairs = function() { return this.keyValuePairs; }
   this.getValue = function(s) { return this.keyValuePairs[s]; }
   this.getParameters = function() { return dir(this.keyValuePairs); } 
   this.getLength = function() { return this.getParameters.length; }

   this.setValue = function(s,v) { this.keyValuePairs[s] = v; }
   this.popValue = function(s) { var v = this.getValue(s); delete this.keyValuePairs[s]; return v }
   this.get = function() {
        var q = "?";
        for (var k in this.keyValuePairs) {
            q += k + "=" + this.keyValuePairs[k] + '&'; 
        }
        return q.substring(0, q.length-1);
   }

   return this

}

function get_select_option(el) {
   return el.options[el.selectedIndex]
}

function InputHidden(name, value) {
    var hid = document.createElement('input');
    hid.type="hidden";
    hid.name=name;
    hid.value=value;
    return hid
}

/**** Dispatch errori AJAX ****/
var ajax_error_global_disappear_interval;

function error_disappear() {
     if (GetElementById('ajax_error_details').style.display == 'none') {
        clearTimeout(ajax_error_global_disappear_interval);
        Effect.Fade('ajax_error');
     }
}
function dispatch_xmlhttp_error(xmlhttp) {
     var ajax_error = GetElementById('ajax_error');
     var ajax_error_details = GetElementById('ajax_error_details');
     AddInnerHTML(ajax_error_details, xmlhttp.responseText);
     ajax_error.style.visibility='visible';
     ajax_error.style.display='block';
     ajax_error_global_disappear_interval = setInterval('error_disappear()', 5000);
}

/* trim delle stringhe */
function ltrim(str) 
{ 
    return str.replace(/^[ \n]+/, ''); 
} 
 
function rtrim(str) 
{ 
    return str.replace(/[ \n]+$/, ''); 
} 
 
function trim(str) 
{ 
    return ltrim(rtrim(str)); 
}