jquery et ajax formulaires

workforme=function(F_MAIN,where){

	
	tinyMCE.triggerSave();
	

	var xhr_object = null;

	if(window.XMLHttpRequest) // Firefox
   xhr_object = new XMLHttpRequest();
	else if(window.ActiveXObject) // Internet Explorer
   xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
	else { // XMLHttpRequest non supporté par le navigateur
   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
	}
	
	
	var method   = "POST";
	var filename = "php/"+where+".php";
	var O_Form = document.getElementById(F_MAIN); 
	var Tab = [];
	
	for( var i=0; i < O_Form.elements.length; i++){ 
  	var Obj = O_Form.elements[i];
	
	Tab.push( Obj.name +'=' +escape(Obj.value));

	}
	
	
	
var data = null;


 data = Tab.join('&'); 
  
xhr_object.open(method, filename, true);

xhr_object.onreadystatechange = function() {
   if(xhr_object.readyState == 1) {
      var tmp = 'Transfert comenc&eacute;';
	  document.getElementById('respi').innerHTML=tmp;
   }
   if(xhr_object.readyState == 2) {
      var tmp = 'Donn&eacute;es tranfer&eacute;es';
	  document.getElementById('respi').innerHTML=tmp;
   }
   if(xhr_object.readyState == 3) {
      var tmp = 'Donn&eacute;es re&ccedil;ues';
	  document.getElementById('respi').innerHTML=tmp;
   }
   if(xhr_object.readyState == 4) {
      var tmp = xhr_object.responseText;
	  document.getElementById('respi').innerHTML=tmp;
   }
}

if(method == "POST")
   xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

xhr_object.send(data);