var efa_default = 100;
var efa_increment = 10;

var efa_smaller = ['<span class="size">',
				   '<strong>A-</strong>',
				   'Schrift kleiner stellen',
				   '&nbsp;&nbsp;'
				   ]

var efa_reset = ['',
				 'Schriftgröße',
				 'Schriftgr&ouml;&szlig;e normal',
				  '&nbsp;&nbsp;'
				  ]

				   
				   var efa_bigger = ['',
				  '<strong style="font-size:1.3em">A+</strong>',
				  'Schrift gr&ouml;sser stellen',
				  '<' +'/span>'
				  ]

function Efa_Fontsize(increment,smaller,reset,bigger,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));
	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.smallerLink = this.getLinkHtml(-1,smaller);
		this.resetLink = this.getLinkHtml(0,reset);
		this.biggerLink = this.getLinkHtml(1,bigger);
	} else {
		this.smallerLink = '';
		this.resetLink = '';
		this.biggerLink = '';
		this.efaInit = new Function('return true;');
	}

	this.allLinks = this.smallerLink + this.resetLink + this.biggerLink;
}
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] + '"':'';
	return html += '>'+ properties[1] + '<' + '/a>' + properties[3];
}
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_smaller,efa_reset,efa_bigger,efa_default);