How to get 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();
}