function lireCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else expires = "";
document.cookie = name + "=" + value + expires + "; path=/";
}

var defaultStyle = "css1";
var currentStyle;
var cookies = lireCookie("style");
var bgStyle = ((cookies == "css1") || (cookies == "css2") || (cookies == "css3") || (cookies == "css4") || (cookies == "css5") || (cookies == "css6") || (cookies == "css7")) ? cookies : defaultStyle;
setActiveStyleSheet(bgStyle);

function setActiveStyleSheet(title) {
var i, a, main;
currentStyle = title;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
a.disabled = true;
if(a.getAttribute("title") == title) a.disabled = false;
}
}
}
window.onunload = function(e) {
createCookie("style", currentStyle, 30);
}