// --------------------------------------------------------------------
// Javascript Magnifier v 0.97
// Written by Dino Termini - termini@email.it - May 9, 2003
// This script is freeware (GPL) but if you use it, please let me know!
//
// Portions of code by zoomIN, zoomOUT
// Author: Nguyen Duong Minh (Obie) - obie4web@yahoo.com
// WWW: http://ObieWebsite.SourceForge.net
// License: GNU (GPL)
//
// Portions of code by Webreference Javascript Cookie Functions
// Jupirmedia Corporation
// http://www.internet.com
// --------------------------------------------------------------------
//
// Please refer to DEMO.htm file for details and usage
//
// --------------------------------------------------------------------

// Configuration parameters
// ------------------------
// Measure unit in pixel (px) or points (pt)
// measureUnit = "pt"
measureUnit = "px"

// Minimum size allowed for SIZE attribute (like in <FONT SIZE="1"> )
minSize = 1;

// Minimum size allowed for STYLE attribute (like in <FONT STYLE="font-size: 10px"> )
minStyleSize = 10;

// Maximum size allowed for SIZE attribute
maxSize = 6;

// Maximum size allowed for STYLE attribute
maxStyleSize = 12;

// Start size for tags with no SIZE attribute defined
startSize = 1;

// Start size for tags with no font-size STYLE or CLASS attribute defined
startStyleSize = 10;

// Increasing and decreasing step
stepSize = 1;

// Increasing step for STYLE definition (measure previously declared will be used)
stepStyleSize = 1;

// "Hard" zoom factor
var zoomFactor = 1.1;

// Max zoom allowed
var maxZoom = 4.096;

// Min zoom allowed
var minZoom = 0.625;

// Initial decrease zoom
var startDecZoom = 0.7;

// Initial increase zoom
var startIncZoom = 1.3;

// Cookie expiry (default one year, actually 365 days)
// 365 days in a year
// 24 hours in a day
// 60 minutes in an hour
// 60 seconds in a minute
// 1000 milliseconds in a second
userExpiry = 365 * 24 * 60 * 60 * 1000;

// Enable or disable alert messages
alertEnabled = false;

// Allow input fields resize (text, buttons, and so on)
allowInputResize = false;

// End of configuration parameters. Please do not edit below this line
// --------------------------------------------------------------------------------

// Input values:
// name - name of the cookie
// value - value of the cookie
// [expires] - expiration date of the cookie (defaults to end of current session)
// [path] - path for which the cookie is valid (defaults to path of calling document)
// [domain] - domain for which the cookie is valid (defaults to domain of calling document)
// [secure] - Boolean value indicating if the cookie transmission requires a secure transmission
// * an argument defaults when it is assigned null as a placeholder
// * a null placeholder is not required for trailing omitted arguments
function setCookie(name, value, expires, path, domain, secure) {
  // Check whether cookies enabled
  document.cookie = "Enabled=true";
  var cookieValid = document.cookie;

  // if retrieving the VALUE we just set actually works
  // then we know cookies enabled
  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);
  }
}

// Input value:
// name - name of the desired cookie
// * return string containing value of specified cookie or null if cookie does not exist
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));
}

// Input values:
// name - name of the cookie
// [path] - path of the cookie (must be same as path used to create cookie)
// [domain] - domain of the cookie (must be same as domain used to create cookie)
// * path and domain default if assigned null or omitted if no explicit argument proceeds
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";
  }
}

// Input value:
// date - any instance of the Date object
// * hand all instances of the Date object to this function for "repairs"
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();

// Fix the bug in Navigator 2.0, Macintosh
fixDate(now);

if (isNaN(myCookieSize)) myCookieSize = 0;
if (isNaN(myCookieStyleSize)) myCookieStyleSize = 0;

// For debug purpose only
// if (!confirm("COOKIE: SIZE ["+myCookieSize+"] STYLESIZE ["+myCookieStyleSize+"]")) return(0);

// Check valid increment/decrement sizes or useCookie parameter
if (useCookie) {
myStepSize = myCookieSize;
myStepStyleSize = myCookieStyleSize;
}

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

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

// Only some tags will be parsed
if (myObjName != "#text" && myObjName != "HTML" &&
  myObjName != "HEAD" && myObjName != "TITLE" &&
  myObjName != "STYLE" && myObjName != "SCRIPT" &&
  myObjName != "BR" && myObjName != "TBODY" &&
  myObjName != "#comment" && myObjName != "FORM") {

// Skip INPUT fields, if required
if (!allowInputResize && myObjName == "INPUT") continue;

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

// Internet Explorer uses a different DOM implementation
if (myObj[i].currentStyle)
  styleSize = parseInt(myObj[i].currentStyle.fontSize);
else 
  styleSize = parseInt(window.getComputedStyle(myObj[i], null).fontSize);

// For debug purpose only. Note: can be very annoying
// if (!confirm("TAG ["+myObjName+"] SIZE ["+size+"] STYLESIZE ["+styleSize+"]")) return(0);

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;
}
} // End if condition ("only some tags")
} // End main for cycle

// Set the cookies
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");
}
}

  } // End if condition ("document.body exists")
} // End function declaration

function increaseFontSize() {
  if (document.body) {
changeFontSize(stepSize, stepStyleSize, false);
  }
  else {
if (alertEnabled) {
alert("Spiacente, il tuo browser non supporta questa funzione");
}
  }
}

function decreaseFontSize() {
  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;