var request = new XMLHttpRequest();
function ReadFile(url) 
{
 request.open("GET",url);
 request.url=url;
 evalResponse:true// первый запрос
 request.onreadystatechange=override;
 request.send(null);
}

function override()
{
 if (request.readyState == 4) 
   {
    request.open("GET",request.url);     // второй запрос
    request.onreadystatechange=readResponse;
    request.send(null);
   }
}

function readResponse()
{ 
	if (request.readyState == 4)
	{
		if(el_id!=1)
		{
			document.getElementById(el_id).innerHTML=request.responseText;
		}
		else
		{
		 eval(request.responseText);
		}
	}
}