https://peakoil.com/forums/styles/thebeeb/template/styleswitcher.js

1
2function fontsizeup(event)
3{
4	// Skip tabs; 9 being the ASCII code for a tab
5	if (event && getKeyCode(event) == 9)
6	{
7		return true;
8	}
9
10	var active = getActiveStyleSheet();
11
12	switch (active)
13	{
14		case 'A--':
15			setActiveStyleSheet('A-');
16		break;
17
18		case 'A-':
19			setActiveStyleSheet('A');
20		break;
21
22		case 'A':
23			setActiveStyleSheet('A+');
24		break;
25
26		case 'A+':
27			setActiveStyleSheet('A++');
28		break;
29
30		case 'A++':
31			setActiveStyleSheet('A');
32		break;
33
34		default:
35			setActiveStyleSheet('A');
36		break;
37	}
38
39	return false;
40}
41
42function fontsizedown(event)
43{
44	// Skip tabs
45	if (event && getKeyCode(event) == 9)
46	{
47		return true;
48	}
49
50	var active = getActiveStyleSheet();
51
52	switch (active)
53	{
54		case 'A++' : 
55			setActiveStyleSheet('A+');
56		break;
57
58		case 'A+' : 
59			setActiveStyleSheet('A');
60		break;
61
62		case 'A' : 
63			setActiveStyleSheet('A-');
64		break;
65
66		case 'A-' : 
67			setActiveStyleSheet('A--');
68		break;
69
70		case 'A--' : 
71		break;
72
73		default :
74			setActiveStyleSheet('A--');
75		break;
76	}
77
78	return false;
79}
80
81function getKeyCode(event)
82{
83	// IE doesn't fire the onkeypress event for tabs
84	// Reference: http://www.quirksmode.org/js/keys.html
85
86	var code = (event.keyCode) ? event.keyCode : 0;
87
88	// Probably using FF
89	if (!code && event.charCode)
90	{
91		code = event.charCode;
92	}
93
94	return code;
95}
96
97function setActiveStyleSheet(title)
98{
99	var i, a, main;
100
101	for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
102	{
103		if (a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title'))
104		{
105			a.disabled = true;
106			if (a.getAttribute('title') == title)
107			{
108				a.disabled = false;
109			}
110		}
111	}
112}
113
114function getActiveStyleSheet()
115{
116	var i, a;
117
118	for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
119	{
120		if (a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title') && !a.disabled)
121		{
122			return a.getAttribute('title');
123		}
124	}
125
126	return null;
127}
128
129function getPreferredStyleSheet()
130{
131	return ('A-');
132}
133
134function createCookie(name, value, days)
135{
136	if (days)
137	{
138		var date = new Date();
139		date.setTime(date.getTime() + (days*24*60*60*1000));
140		var expires = '; expires=' + date.toGMTString();
141	}
142	else
143	{
144		expires = '';
145	}
146
147	document.cookie = name + '=' + value + expires + style_cookie_settings;
148}
149
150function readCookie(name)
151{
152	var nameEQ = name + '=';
153	var ca = document.cookie.split(';');
154
155	for (var i = 0; i < ca.length; i++)
156	{
157		var c = ca[i];
158
159		while (c.charAt(0) == ' ')
160		{
161			c = c.substring(1, c.length);
162		}
163
164		if (c.indexOf(nameEQ) == 0)
165		{
166			return c.substring(nameEQ.length, c.length);
167		}
168	}
169
170	return null;
171}
172
173function load_cookie()
174{
175	var cookie = readCookie('style_cookie');
176	var title = cookie ? cookie : getPreferredStyleSheet();
177	setActiveStyleSheet(title);
178}
179
180function unload_cookie()
181{
182	var title = getActiveStyleSheet();
183	createCookie('style_cookie', title, 365);
184}
185
186onload_functions.push('load_cookie()');
187onunload_functions.push('unload_cookie()');
188
189/*
190var cookie = readCookie("style");
191var title = cookie ? cookie : getPreferredStyleSheet();
192setActiveStyleSheet(title);
193*/