var http_request = false;
   function makePOSTRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	  http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
			off('sb');
			loading("resultd");//loading
            result = http_request.responseText;
		    document.getElementById('resultd').innerHTML = result; 
			on('sb');
		    } else {
            alert('یک مشکل پیش آمده است.');
         }
      }
   }
   function loading(ob)
     {
     document.getElementById(ob).innerHTML = '<img src="images/loading.gif" width="16" height="16"     align="absmiddle" /> در حال ارسال...';
    }
   function get(obj) {
    smail=document.getElementById('from').value;
	name=document.getElementById('name').value;
    subj=document.getElementById('sbj').value;
    message=document.getElementById('msg').value;
   secode=document.getElementById('security_code').value;
   var poststr = "from=" + smail+"&name=" + name + "&sbj=" + subj + "&msg=" + message + "&security_code=" + secode;
      makePOSTRequest('process_mail.php', poststr);
   }
//-------------------
function off(itm)
{
 obj1=document.getElementById(itm);
 obj1.disabled=true;
 }
function on(itm)
{
 obj2=document.getElementById(itm);
 obj2.disabled=false;
 }