var bodyElement = null;



// Default Groesse
var defaultSize = 80;

// Groessenaenderung in Prozent
var sizeIncrement = 20;

// aktuelle Groesse
var bodySize = defaultSize;


function getCookieVal (offset) {  
var endstr = document.cookie.indexOf (";", offset);  
if (endstr == -1)    
endstr = document.cookie.length;  
return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) {  
var arg = name + "=";  
var alen = arg.length;  
var clen = document.cookie.length;  
var i = 0;  
while (i < clen) {    
var j = i + alen;    
if (document.cookie.substring(i, j) == arg)      
return getCookieVal (j);    
i = document.cookie.indexOf(" ", i) + 1;    
if (i == 0) break;   
}  
return null;
}
function SetCookie (name, value) {  
var argv = SetCookie.arguments;  
var argc = SetCookie.arguments.length;  
var expires = (argc > 2) ? argv[2] : null;  
var path = (argc > 3) ? argv[3] : null;  
var domain = (argc > 4) ? argv[4] : null;  
var secure = (argc > 5) ? argv[5] : false;  
document.cookie = name + "=" + escape (value) + 
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
((path == null) ? "" : ("; path=" + path)) +  
((domain == null) ? "" : ("; domain=" + domain)) +    
((secure == true) ? "; secure" : "");
}
function DeleteCookie (name) {  
var exp = new Date();  
exp.setTime (exp.getTime() - 1);  
var cval = GetCookie (name);  
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

// Initialisierung der Groesse
function initFont(initSize)
{
  var cookieSize = GetCookie('glt05fontsize');
  if (cookieSize != null) {
      initSize = parseInt(cookieSize);
  }

  if (document.getElementsByTagName('body') != null && initSize != null)
  {
    bodyElement = document.getElementsByTagName('body')[0];
    if (bodyElement == null)
    {
      bodyElement = document.body;
    }
    defaultSize = initSize;
    sizeIncrement = 10;
    bodySize = defaultSize;
    setFontSize(bodySize);
  }
}

// Groesse aendern
function setFontSize (size)
{
  if (bodyElement != null && size != null)
  {
    if (size > 150) size = 150;
    SetCookie('glt05fontsize', size);
    bodyElement.style.fontSize = size + '%';
  }
}

// Groesse verkleinern
function sizeSmaler()
{
  bodySize -= sizeIncrement;
  setFontSize(bodySize);
}

// Groesse vergroessern
function sizeBigger()
{
  bodySize += sizeIncrement;
  setFontSize(bodySize);
}

// Groesse zurueksetzen
function sizeReset()
{
  bodySize = defaultSize;
  setFontSize(bodySize);
}