/*
	To implement this script in your Web page, configure this file as
	shown below, then put this file on your Web server.
	
	Next, insert the following at the beginning of the <head> section
	of your Web page:

		<script type="text/javascript" language="JavaScript1.2" src="[path]fun_fontsize.js"></script>

	where [path] is the path to this file on your server.
	
	Insert the following right after the <body> tag:

		<script type="text/javascript" language="JavaScript1.2">
			if (efa_fontSize) efa_fontSize.efaInit();
		</script>
	
	Finally, insert the following where you wish the links to change the
	text size to appear: 

		<script type="text/javascript" language="JavaScript1.2">
			if (efa_fontSize) document.write(efa_fontSize.allLinks);
		</script>
*/

/*
	fun_increment = percentage by which each click increases/decreases size
	fun_bigger = array of properties for 'increase font size' link
	fun_reset = array of properties for 'reset font size' link
	fun_smaller = array of properties for 'decrease font size' link

	properties array format:
		['before HTML',
		 'inside HTML',
		 'title text',
		 'class text',
		 'id text',
		 'name text',
		 'accesskey text',
		 'onmouseover JavaScript',
		 'onmouseout JavaScript',
		 'on focus JavaScript',
		 'after HTML'
		 ]
*/

var efa_default = 100;
var efa_increment = 10;
var efa_bigger = ['<h3>Schriftgr&ouml;sse: </h3> <span class="font">',
	'+',
	'Schrift gr&ouml;&szlig;er stellen',
	'',
	'',
	'',
	'',
	'',
	'',
	'',
	'<' + '/span>'
	]

var efa_reset = ['<span class="font">',
	' = ',
	'Schrift zur&uuml;cksetzen',
	'',
	'',
	'',
	'',
	'',
	'',
	'',
	'<' + '/span>'
	]

var efa_smaller = ['<span class="font">',
	'-',
	'Schrift kleiner stellen',
	'',
	'',
	'',
	'',
	'',
	'',
	'',
	'<' + '/span>'
	]

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));

	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.resetLink = this.getLinkHtml(0,reset);
		this.smallerLink = this.getLinkHtml(-1,smaller);
	} else {
		this.biggerLink = '';
		this.resetLink = '';
		this.smallerLink = '';
		this.efaInit = new Function('return true;');
	}

	this.allLinks = this.biggerLink + this.resetLink + this.smallerLink;
}

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);

