function ajax(url, ret, params, disable_loading){
// AJAX v1.3
// Coded by HANT
// 30.05.2006
// Support: IE5,6,7 , Firefox, Opera
//
var _ajax;

// remove this
if(disable_loading!=true){
show("loading");
}
// end of remove this

function db(){
if(_ajax.readyState == 4 && _ajax.status == 200){

// remove this
if(disable_loading!=true){
hide("loading");
}
// end of remove this

if(ret!=false){
ret(_ajax.responseText);
}
}
}
if(window.XMLHttpRequest){
_ajax = new XMLHttpRequest();
_ajax.onreadystatechange = db;
}else{
_ajax = new ActiveXObject("Microsoft.XMLHTTP");
_ajax.onreadystatechange = db;
}

_ajax.open((params ? "POST" : "GET"), url, true);

_ajax.setRequestHeader("Cache-control", "no-cache");

if(params){
_ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
_ajax.setRequestHeader("Content-length", params.length);
}

_ajax.send(params ? params : null);
}



// POP-Up function
function popup(url,w,h){
var left = Math.ceil(screen.width-w)/2;
var top = Math.ceil(screen.height-h)/2;
var rand_name = ""+Math.random();
    rand_name = rand_name.split(".");
window.open(url, rand_name[1], 'toolbar=0,location=0,statusbar=0,menubar=0,resizable=0,width='+w+',height='+h+',left = '+left+',top = '+top+',scrollbars=yes');
}

// end of pop-up



function show_content(url){
popup(url, 680, 550);
}



// GET Function
function get(get_url, where){

ajax(get_url, get_result);

function get_result(str){
document.getElementById(where).innerHTML = str;
}

}// end of get



// POST Function
function post(post_url, post_vars){

ajax(post_url, false, post_vars);

}// end of post


function show(id) {
var item = null;
item = document.getElementById(id);
item.style.display = "";
}


function hide(id){
var item = null;
item = document.getElementById(id);
item.style.display = "none";
}



function scrollup(){
for(var i=0; i<300; i++){
window.scrollBy(0,-5);
}
}

function scrolldown(){
for(var i=0; i<20; i++){
window.scrollBy(0,50);
}
}


function rand(min, max){
return Math.round((Math.random()*(max-min))+min)
}



function center_div(id,w,h){
var left = Math.ceil(screen.width-w)/2;
var top = Math.ceil(screen.height-h)/2;
document.getElementById(id).style.left = left;
document.getElementById(id).style.left = top;
}




function js_in_array(the_needle, the_haystack){
var the_hay = the_haystack.toString();
if(the_hay == ''){
return false;
}
var the_pattern = new RegExp(the_needle, 'g');
var matched = the_pattern.test(the_haystack);
return matched;
}