function text(frm,error,imgTxt){
	var obj = document.getElementById(frm);
	var errorForm = document.getElementById(error);
	var img = document.getElementById(imgTxt);
	//obj.innerHTML = "";
	var request = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	request.open("POST", "text.php", true);
	request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	request.onreadystatechange = function(){
		if (request.readyState == 3){
			img.src = "none";
			errorForm.innerHTML = '<img src="img/loading.gif"> Cargando imagen...';
		} else {
			if (request.readyState == 4){
				var json = eval("(" + request.responseText + ")");
				if (json.imageTxt){
					errorForm.innerHTML = '';
					img.innerHTML = "<img src='getImage.php?imageName=" + json.imagen + "&t=" + (new Date).getTime() + "'>";
				}else
  	   		errorForm.innerHTML = 'Ha ocurrido un error. Pongase en contacto con el administrador';
			}
		}
	};
	request.send("id_cliente=" + obj.id_cliente.value + "&prd=" + obj.prd.value + "&txt1=" + obj.linea1.value + "&txt2=" + obj.linea2.value + "&txt3=" + obj.linea3.value + "&txt4=" + obj.linea4.value + "&font=" + obj.font.value + "&size=" + obj.size.value);
};