measureUnit = "px"
minSize = 1;
minStyleSize = 10;
maxSize = 6;
maxStyleSize = 30;
startSize = 1;
startStyleSize = 10;
stepSize = 1;
stepStyleSize = 2;
var keyin = 61;
var keyinCAPS = 43;
var keyout = 45;
var keyoutCAPS = 95;
var keyinIe = 46;
var keyinIeCAPS = 62;
var keyoutIe = 44;
var keyoutIeCAPS = 60;
var zoomFactor = 1.1;
var maxZoom = 4.096;
var minZoom = 0.625;
var startDecZoom = 0.7;
var startIncZoom = 1.3;
//userExpiry = 365 * 24 * 60 * 60 * 1000;

userExpiry = 10* 1000;
alertEnabled = false;
allowInputResize = false;

function setCookie(name, value, expires, path, domain, secure) {
  document.cookie = "Enabled=true";
  var cookieValid = document.cookie;
  if (cookieValid.indexOf("Enabled=true") != -1) {
    var curCookie = name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.toGMTString() : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");

    document.cookie = curCookie;
    return(true);
  }
  else {
    return(false);
  }
}

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}
function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" + 
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}
function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}

function searchTags(childTree, level) {
  var retArray = new Array();
  var tmpArray = new Array();
  var j = 0;
  var childName = "";
  for (var i=0; i<childTree.length; i++) {
    childName = childTree[i].nodeName;
    if (childTree[i].hasChildNodes()) {
      if ((childTree[i].childNodes.length == 1) && (childTree[i].childNodes[0].nodeName == "#text"))
        retArray[j++] = childTree[i];
      else {
        tmpArray = searchTags(childTree[i].childNodes, level+1);
        for (var k=0;k<tmpArray.length; k++)
          retArray[j++] = tmpArray[k];
        retArray[j++] = childTree[i];
      }
    }
    else
      retArray[j++] = childTree[i];
  }
  return(retArray);
}

function changeFontSize(stepSize, stepStyleSize, useCookie) {

  if (document.body) {
    var myObj = searchTags(document.body.childNodes, 0);
    var myCookieSize = parseInt(getCookie("incrSize"));
    var myCookieStyleSize = parseInt(getCookie("incrStyleSize"));
    var myStepSize = stepSize;
    var myStepStyleSize = stepStyleSize;

    var now = new Date();
    fixDate(now);

    if (isNaN(myCookieSize)) myCookieSize = 0;
    if (isNaN(myCookieStyleSize)) myCookieStyleSize = 0;
    if (useCookie) {
      myStepSize = myCookieSize;
      myStepStyleSize = myCookieStyleSize;
    }

    now.setTime(now.getTime() + userExpiry);

    myObjNumChilds = myObj.length;
    for (i=0; i<myObjNumChilds; i++) {
      myObjName = myObj[i].nodeName;

      if (myObjName != "#text" && myObjName != "HTML" &&
          myObjName != "HEAD" && myObjName != "TITLE" &&
          myObjName != "STYLE" && myObjName != "SCRIPT" &&
          myObjName != "BR" && myObjName != "TBODY" &&
          myObjName != "#comment" && myObjName != "FORM") {

          if (!allowInputResize && (myObjName == "INPUT" || myObjName=="SELECT")) continue;
          

        size = parseInt(myObj[i].getAttribute("size"));

        if (myObj[i].currentStyle)
          styleSize = parseInt(myObj[i].currentStyle.fontSize);
        else 
          styleSize = parseInt(window.getComputedStyle(myObj[i], null).fontSize);

        if (isNaN(size) || (size < minSize) || (size > maxSize))
          size = startSize;

        if (isNaN(styleSize) || (styleSize < minStyleSize) || (styleSize > maxStyleSize))
          styleSize = startStyleSize;

        if ( ((size > minSize) && (size < maxSize)) || 
             ((size == minSize) && (stepSize > 0)) || 
             ((size == maxSize) && (stepSize < 0)) || useCookie) {
          myObj[i].setAttribute("size", size+myStepSize);
        }

        if ( ((styleSize > minStyleSize) && (styleSize < maxStyleSize)) || 
             ((styleSize == minStyleSize) && (stepStyleSize > 0)) ||
             ((styleSize == maxStyleSize) && (stepStyleSize < 0)) || useCookie) {
          newStyleSize = styleSize+myStepStyleSize;
          myObj[i].style.fontSize = newStyleSize+measureUnit;
        }
      } 
    }
    if (!useCookie) {
      cookieIsSet = setCookie("incrSize", myStepSize+myCookieSize, now);
      cookieIsSet = setCookie("incrStyleSize", myStepStyleSize+myCookieStyleSize, now);
      if (alertEnabled && !cookieIsSet) {
        alert("Per mantenere in memoria la dimensione scelta, abilita i cookie nel browser");
      }
    }

  }
}

function increaseFontSize() 
{


 var myCookieSize = getCookie("incrSize")==null ? 0:parseInt(getCookie("incrSize"));
    if(myCookieSize<2)
    {
   
      if (document.body)
      {
        changeFontSize(stepSize, stepStyleSize, false);
      }
      else
      {
        if (alertEnabled) 
        {
          alert("Spiacente, il tuo browser non supporta questa funzione");
        }
      }
    }
}

function decreaseFontSize() 
{

 
 var myCookieSize = getCookie("incrSize")==null ? 0:parseInt(getCookie("incrSize"));
 if(myCookieSize>-2)
 {
  
    if (document.body)
    {
        myStepSize = -stepSize;
        myStepStyleSize = -stepStyleSize;
        changeFontSize(myStepSize, myStepStyleSize, false);
    }
    else 
    {
       if (alertEnabled)
       {
          alert("Spiacente, il tuo browser non supporta questa funzione");
       }
    }
  }
}

function zoomin() {
  if (window.parent.document.body.style.zoom < maxZoom) {
    if (window.parent.document.body.style.zoom > 0) {
      window.parent.document.body.style.zoom *= zoomFactor; 
    }
    else { 
      window.parent.document.body.style.zoom = startIncZoom;
    }
  }
  else {
    if (alertEnabled) {
      alert("Warning: Max size reached");
    }
  }
}

function zoomout() {
  if ( (window.parent.document.body.style.zoom > minZoom) ||
       (window.parent.document.body.style.zoom == 0) ) {
    if (window.parent.document.body.style.zoom > 0) {
      window.parent.document.body.style.zoom /= zoomFactor; 
    }
    else {
      window.parent.document.body.style.zoom = startDecZoom;
    }
  }
  else {
    if (alertEnabled) {
      alert("Warning: Min size reached");
    }
  }
}

function checkzoom(e) {

  if (document.all) {
    myEvent = event.keyCode;
  }
  else {
    myEvent = e.which;
  }

  switch(myEvent) {
    case keyinIe:
    case keyinIeCAPS:
      zoomin();
      break;

    case keyoutIe:
    case keyoutIeCAPS:
      zoomout();
      break;

    case keyin:
    case keyinCAPS:
      increaseFontSize();
      break;

    case keyout:
    case keyoutCAPS:
      decreaseFontSize();
      break;

    default:
      break;
  }
}

if (document.layers) {
  document.captureEvents(Event.KEYPRESS);
}

//document.onkeypress = checkzoom;