function $(e){return document.getElementById(e);}
function $T(e,t){e = e||document;return e.getElementsByTagName(t);}
function Ajax() {}
Ajax.Get = function(u,a,s)
{
    xReq = false;
    
    if (window.XMLHttpRequest) {
        xReq = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
        xReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    
    if(s) u += "&t=" + (new Date()).valueOf();
    xReq.open("GET", u, true);
    xReq.onreadystatechange = function() {
        if (xReq.readyState == 4) {a(xReq.responseText);}
    }
    xReq.send(null);
}   
Ajax.Post = function(u,a,q,s)
{
    xReq = false;
    
    if (window.XMLHttpRequest) {
        xReq = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
        xReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    
    if(s) u += "&t=" + (new Date()).valueOf();
    xReq.open("POST", u, true);
    xReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xReq.onreadystatechange = function() {
        if (xReq.readyState == 4) a(xReq.responseText);
    }
    xReq.send(q);
}
function Register(e)
{
    Ajax.Get("Register.aspx?username=" + escape($(e).value), function(x){$("Existence").innerHTML=x});
}
function AddToCart(t,i)
{
    t.style.display="none";
    t = t.parentNode;
    t.innerHTML="<img src='Media/ajax-loader.gif' />";
    Ajax.Get("Cart.aspx?id=" + i, function(x){t.innerHTML=x;if(x=="Chọn ảnh thành công!"){var e=$("CartCount");if(e)e.innerHTML=parseInt(e.innerHTML)+1;}});
    return false;
}