function respuestaConvert() {
    if (req.readyState == 4) {
        if (req.status == 200) {
			resp = req.responseText.split("|");	
			/*switch(resp[0]){
				case "NOO": alert("invalid objet"); break; 
				case "NOQ": alert("no quantite"); break; 
				case "NOC": alert("no credits"); break; 
				case "OK":  window.location = "magasin.php?id="+resp[1]; break; 
			}*/
			if(resp[0] == "NOK"){
				//<?php echo("alert('".txConv->finales[2]."');"); ?>
				
				converterError();
				
			}
			else{
				converterDone();
				changeCR1(resp[0]);
				changeCR2(resp[1]);
			}
			//window.location = "magasin.php?id="+p;
        } else {
  			alert ("Not able to retrieve description");
        }
    } else {
		espera();
	}
}
function espera()
{
	return true;
}
function convertir()
{

	if (window.XMLHttpRequest) {
    	req = new XMLHttpRequest();
  	} else if (window.ActiveXObject) {
  		req = new ActiveXObject("Microsoft.XMLHTTP");
  	}
	unidades = document.getElementById("units").options[document.getElementById("units").options.selectedIndex].value;
	if(unidades >0 && unidades<=10){
  		req.onreadystatechange = respuestaConvert;
  		req.open("POST", "converter.php", true);
  		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  		req.send("act=convertir&u="+unidades);
	}
	else{
		alert("Invalid");	
	}
	
}