function getData(arg){
	
	   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..."); 
	   return; 
	} 
	 if (arg == "sans"){
			arg =  document.getElementById('textfield2').value
	 }
	 else
	 {
			arg = arg; 
	 }
	xhr_object.open("GET", "carte1.php?textfield2="+arg, false); 
	xhr_object.send(null); 
	
	   
	      if(xhr_object.readyState == 4) 
	        	document.getElementById('contenuTable').innerHTML = xhr_object.responseText;
	 
	    
}