var efa_default = 83;
var efa_increment = 10;

var efa_bigger = ['<div id="sizer">',
                  '<img src="_groesser.gif" width="17" height="16" alt="gr&ouml;&szlig;er" border="0">',
                  'gr&ouml;&szlig;er',
                  '',
                  '',
                  '',
                  '',
                  '',
                  '',
                  'if(this.blur)this.blur()',
                  ''
                  ]

var efa_smaller = ['',
                   '<img src="_kleiner.gif" width="17" height="16" alt="kleiner" border="0">',
                   'kleiner',
                   '',
                   '',
                   '',
                   '',
                   '',
                   '',
                   'if(this.blur)this.blur()',
                   ''
                   ]

var efa_reset = ['',
                 '<img src="_normal.gif" width="17" height="16" alt="normal" border="0">',
                 'normal',
                  '',
                  '',
                  '',
                  '',
                  '',
                  '',
                  'if(this.blur)this.blur()',
                  '<' + '/div>'
                  ]

function Efa_Fontsize(increment,bigger,reset,smaller,def) {
    this.w3c = (document.getElementById);
    this.ms = (document.all);
    this.userAgent = navigator.userAgent.toLowerCase();
    this.isOldOp = ((this.userAgent.indexOf('opera') != -1)&&(parseFloat(this.userAgent.substr(this.userAgent.indexOf('opera')+5)) <= 7));
    this.isMacIE = ((this.userAgent.indexOf('msie') != -1) && (this.userAgent.indexOf('mac') != -1) && (this.userAgent.indexOf('opera') == -1));
    if ((this.w3c || this.ms) && !this.isOldOp && !this.isMacIE) {
        this.name = "efa_fontSize";
        this.cookieName = 'efaSize';
        this.increment = increment;
        this.def = def;
        this.defPx = Math.round(16*(def/100))
        this.base = 1;
        this.pref = this.getPref();
        this.testHTML = '<div id="efaTest" style="position:absolute;visibility:hidden;line-height:1em;">&nbsp;</div>';
        this.biggerLink = this.getLinkHtml(1,bigger);
        this.smallerLink = this.getLinkHtml(-1,smaller);
        this.resetLink = this.getLinkHtml(0,reset);
    } else {
        this.biggerLink = '';
        this.smallerLink = '';
        this.resetLink = '';
        this.efaInit = new Function('return true;');
    }
    this.allLinks = this.biggerLink + this.smallerLink + this.resetLink;
}
Efa_Fontsize.prototype.efaInit = function() {
        document.writeln(this.testHTML);
        this.body = (this.w3c)?document.getElementsByTagName('body')[0].style:document.all.tags('body')[0].style;
        this.efaTest = (this.w3c)?document.getElementById('efaTest'):document.all['efaTest'];
        var h = (this.efaTest.clientHeight)?parseInt(this.efaTest.clientHeight):(this.efaTest.offsetHeight)?parseInt(this.efaTest.offsetHeight):999;
        if (h < this.defPx) this.base = this.defPx/h;
        this.body.fontSize = Math.round(this.pref*this.base) + '%';
}
Efa_Fontsize.prototype.getLinkHtml = function(direction,properties) {
    var html = properties[0] + '<a href="#" onclick="efa_fontSize.setSize(' + direction + '); return false;"';
    html += (properties[2])?'title="' + properties[2] + '"':'';
    html += (properties[3])?'class="' + properties[3] + '"':'';
    html += (properties[4])?'id="' + properties[4] + '"':'';
    html += (properties[5])?'name="' + properties[5] + '"':'';
    html += (properties[6])?'accesskey="' + properties[6] + '"':'';
    html += (properties[7])?'onmouseover="' + properties[7] + '"':'';
    html += (properties[8])?'onmouseout="' + properties[8] + '"':'';
    html += (properties[9])?'onfocus="' + properties[9] + '"':'';
    return html += '>'+ properties[1] + '<' + '/a>' + properties[10];
}
Efa_Fontsize.prototype.getPref = function() {
    var pref = this.getCookie(this.cookieName);
    if (pref) return parseInt(pref);
    else return this.def;
}
Efa_Fontsize.prototype.setSize = function(direction) {
    this.pref = (direction)?this.pref+(direction*this.increment):this.def;
    this.setCookie(this.cookieName,this.pref);
    this.body.fontSize = Math.round(this.pref*this.base) + '%';
}
Efa_Fontsize.prototype.getCookie = function(cookieName) {
    var cookie = cookieManager.getCookie(cookieName);
    return (cookie)?cookie:false;
}
Efa_Fontsize.prototype.setCookie = function(cookieName,cookieValue) {
    return cookieManager.setCookie(cookieName,cookieValue);
}

var  efa_fontSize = new Efa_Fontsize(efa_increment,efa_bigger,efa_reset,efa_smaller,efa_default);