How to getting values from cookies to set widgets?

function getCookieData(labelName) {

//from Danny Goodman

var labelLen = labelName.length;

// read cookie property only once for speed

var cookieData = document.cookie;

var cLen = cookieData.length;

var i = 0;

var cEnd;

while (i < cLen) {

var j = i + labelLen;

if (cookieData.substring(i,j) == labelName) {

cEnd = cookieData.indexOf(";",j);

if (cEnd == -1) {

cEnd = cookieData.length;

}

return unescape(cookieData.substring(j+1, cEnd));

}

i++;

}

return "";

}

//init() is called from the body tag onload function.

function init() {

setValueFromCookie("brand");

setValueFromCookie("market");

setValueFromCookie("measure");

}

function setValueFromCookie(widget) {

if( getCookieData(widget) != "") {

document.getElementById(widget).value = getCookieData(widget);

}

}

//if you name your cookies the widget ID, you can use the following helper function

function setCookie(widget) {

document.cookie = widget + "=" +

escape(document.getElementById(widget).value) + getExpirationString();

}