https://rougemont-le-chateau.fr/javascript/font.js

1function init(){
2	size=getCookie("dc_fontsize");
3	if (size!=null && size!='')
4		document.getElementsByTagName("body")[0].style.fontSize=size;
5	else {
6		document.getElementsByTagName("body")[0].style.fontSize="0.8em";
7		storeSize();
8	}
9}
10
11/* function changeSize(add) */
12
13function changeSize(add){
14	foo=document.getElementsByTagName("body")[0].style.fontSize;
15	bar=foo.split(".");
16	
17	entier=parseInt(bar[0]);
18
19	if(bar[1])
20		decimal=parseInt(bar[1].substr(0,1));
21	else
22		decimal=0;
23
24	if(decimal==0 && add<0) {
25		entier+=add;
26		decimal=9;
27	}
28	else if(decimal==9 && add>0) {
29		entier+=add;
30		decimal=0;
31	}
32	else {
33		decimal+=add;
34	}
35
36	size=entier+"."+decimal;
37
38	if(size=='0.5')
39		size='0.6';
40
41	if(size=='2.0')
42		size='1.9';
43
44	document.getElementsByTagName("body")[0].style.fontSize=size+"em";
45	  for(i=0; (a = document.getElementsByTagName("p")[i]); i++) {
46		document.getElementsByTagName("p")[i].style.fontSize=size+"em";
47	  }
48
49	storeSize();
50}
51
52/* function storeSize() */
53
54function storeSize(){
55	var exp = new Date();
56	exp.setTime(exp.getTime() + 24*60*60*90*1000);
57	size=document.getElementsByTagName("body")[0].style.fontSize;
58	setCookie("dc_fontsize",size,exp,"/");
59}
60
61/* function setCookie() */
62
63function setCookie(name, value, expires, path, domain, secure) { 
64	var curCookie = name + "=" + escape(value) + 
65	((expires) ? "; expires=" + expires.toGMTString() : "") + 
66	((path) ? "; path=" + path : "") + 
67	((domain) ? "; domain=" + domain : "") + 
68	((secure) ? "; secure" : "") 
69	document.cookie = curCookie 
70} 
71
72/* function getCookie() */
73
74function getCookie(name) { 
75	var prefix = name + "=" 
76	var cookieStartIndex = document.cookie.indexOf(prefix) 
77	if (cookieStartIndex == -1) 
78	return null 
79	var cookieEndIndex = document.cookie.indexOf(";", cookieStartIndex + 
80	prefix.length) 
81	if (cookieEndIndex == -1) 
82	cookieEndIndex = document.cookie.length 
83	return unescape(document.cookie.substring(cookieStartIndex + 
84	prefix.length, 
85	cookieEndIndex)) 
86}