function doajax(serverPage, obj) {
     //AJAX
	hidden = document.getElementById('body');
	hidden.innerHTML = '<img src="images/spinner.gif" alt="" /> ' + 'Loading...';
	document.getElementById(obj).style.visibility = "visible";
	
     var req = Inint_AJAX();
     req.onreadystatechange = function () { 
          if (req.readyState==4) {
               if (req.status==200) {
                    document.getElementById(obj).innerHTML = req.responseText;
               } 
          } 
     };
     //สร้าง connection
     req.open("GET", serverPage, true); 
     req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     req.send(null); //ส่งค่า
};

function subajax(serverPage, obj) {
     //AJAX
	hidden = document.getElementById('subbody');
	hidden.innerHTML = '<img src="images/spinner.gif" alt="" /> ' + 'Loading...';
	document.getElementById(obj).style.visibility = "visible";
	
     var req = Inint_AJAX();
     req.onreadystatechange = function () { 
          if (req.readyState==4) {
               if (req.status==200) {
                    document.getElementById(obj).innerHTML = req.responseText;
               } 
          } 
     };
     //สร้าง connection
     req.open("GET", serverPage, true); 
     req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     req.send(null); //ส่งค่า
};

/* เรียก windows แบบ popup */
var win = null;
function popupwindow(filename, windowname, w, h) {
     var winl = (screen.width-w)/2;
     var wint = (screen.height-h)/2;
     if (winl < 0) winl = 0;
     if (wint < 0) wint = 0;
     var settings = 'height=' + h + ',';
     settings += 'width=' + w + ',';
     settings += 'top=' + wint + ',';
     settings += 'left=' + winl + ',';
     settings += 'resizable=0, scrollbars=1, status=0,toolbar=0, menubars=0, location=0';
     win = window.open('./'+filename, windowname, settings);
     win.window.focus();
}