Javascript for reading a cookie

utils.js

//<![CDATA[
/**
 * This function returns the named cookie if it exists.
 * @param {type} cname The name of the cookie.
 * @returns {String} The cookie value.
 */
function getCookie(cname) {
    var name = cname + "=";
    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);
        }
        if (c.indexOf(name) === 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}
//]]>