/** cookie functions **/
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 var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(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 eraseCookie(name) {
    createCookie(name,"",-1);
}
/** query string functions **/
function getQueryString(key) {
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] == key) return pair[1];
    }
    return null;
}
function setQueryString(query, key, value) {
    var vars = query.split("&");
    var found = false;
    query = "";
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] != "") {
            if (pair[0] == key) {
                query += (query == "" ? "" : "&") + key + "=" + value;
                found = true;
            }
            else query += (query == "" ? "" : "&") + pair[0] + "=" + pair[1];
        }
    }
    if (!found) query += (query == "" ? "" : "&") + key + "=" + value;
    return query;
}
/** object functions **/
function getObject(id) {
    if (document.getElementById) return document.getElementById(id);
    else if (document.layers) return eval("document.layers['" + id + "']");
    else if (document.all) return eval("document.all." + id);
}