function GetXmlHttpObject(){
    if(window.XMLHttpRequest){
        // code for IE7+, Firefox, Chrome, Opera, Safari
        return new XMLHttpRequest();
    }
    else if (window.ActiveXObject){
        // code for IE6, IE5
        return new ActiveXObject("Microsoft.XMLHTTP");
    }
        else{
            return null;
    }
}


function ajax_query(condition,file,span_layer,loadding){
    var obj_ajax=GetXmlHttpObject();
    if(obj_ajax==null){
        alert("Your browser does not support XMLHTTP!");
        return;
    }
    var url=file+'?'+condition;
    //alert(condition+' - '+file+' - '+span_layer+' - '+url);
    obj_ajax.open("get",url,true);
    obj_ajax.onreadystatechange=function add(){
    if (obj_ajax.readyState==4){
        document.getElementById(span_layer).innerHTML=obj_ajax.responseText;
		  
    } else{
		if(loadding==0){
           document.getElementById(span_layer).innerHTML='<table align="center" widht="100%" height="100%"><tr><td><img src=\'js/loading.gif\' /></td></tr></table>';
		}
    }
    };
    obj_ajax.send(null);
}