var http = null;

function createRequestObject()
{
    if(window.XMLHttpRequest)
    {
        http = new XMLHttpRequest();
    }
    else if(window.ActiveXObject)
    {
        http = new ActiveXObject("Microsoft.XMLHTTP");
    }
}

function sendRequest(page, callBack)
{
	http.open('get', page, true);
	http.onreadystatechange = callBack;
	http.send(null);
}