var xmlHttp;
function set_ajax(ajx_file,async)
{
	try
	{
	// Firefox, Opera 8.0+, Safari
	xmlHttp = new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
  		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
    	{
    		try
      		{
      			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      		}
    		catch (e)
      		{
      			alert("Your browser does not support AJAX!");
      			return false;
      		}
    	}
  	}
  	
  	xmlHttp.onreadystatechange= get_ajax;
  	
  	xmlHttp.open("POST",ajx_file,async);
  	xmlHttp.send(null);
}
function get_ajax()
{
	if(xmlHttp.readyState==4)
	return xmlHttp.responseText;

};