var HttpRequestObject = createHttpRequestObject();

function createHttpRequestObject()
{
	 if (window.XMLHttpRequest) {
        try {
            return new XMLHttpRequest();
        } catch (e){}
    } else if (window.ActiveXObject) {
        try {
            return new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e){
          try {
              return new ActiveXObject('Microsoft.XMLHTTP');
          } catch (e){}
        }
    }
    return null;
}

function get_tab(pid, tab)
{	
	if(HttpRequestObject.readyState == 4 || HttpRequestObject.readyState == 0)
	{
		HttpRequestObject.open("GET", "/get_tab.php?pid=" + pid + "&tab=" + tab, true);
		HttpRequestObject.onreadystatechange = handleServerResponse;
		HttpRequestObject.send(null);
	}
}

function handleServerResponse()
{
	if(HttpRequestObject.readyState == 4 && HttpRequestObject.status == 200)
	{
			ResponceText = HttpRequestObject.responseText;
			document.getElementById("div_tab").innerHTML = ResponceText;
	}
}