function nuevoAjax(){
        var xmlhttp=false;
        try{
                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(e){
                try {
                        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                }catch(E){
                        xmlhttp = false;
                }
        }
        if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
                xmlhttp = new XMLHttpRequest();
        }
        return xmlhttp;
}
function enviarMail(){
	c = document.getElementById('resultado_mensaje');

	//variable=documenet.nombre_del_form.nombre_del_control.value
	name=document.enviar_email.name.value;
	surname=document.enviar_email.surname.value;
	phone=document.enviar_email.phone.value;
	email=document.enviar_email.email.value;
	city=document.enviar_email.city.value;
	prod=document.enviar_email.prod.value;
	comment=document.enviar_email.comment.value;

	ajax=nuevoAjax();

	c.innerHTML = '<p style="text-align:center;"><img src="esperando.gif"/></p>';
	ajax.open("POST", "envia_mail.php",true);
	ajax.onreadystatechange=function() {
		if (ajax.readyState==4) {
			c.innerHTML = ajax.responseText
		}
		borrarCampos()
	}
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send("name="+name+"&surname="+surname+"&phone="+phone+"&email="+email+"&city="+city+"&prod="+prod+"&comment="+comment);
}


function borrarCampos(){
	document.enviar_email.name.value="";
	document.enviar_email.surname.value="";
	document.enviar_email.phone.value="";
	document.enviar_email.email.value="";
	document.enviar_email.city.value="";
	document.enviar_email.prod.value="";
	document.enviar_email.comment.value="";

	document.enviar_email.name.focus();
}