counter = 1;
function addFormField() {

  email = "E-Mail-Adresse";
$("#divTxt").append("<div id='field" + counter + "'><br><label for='txt" + counter +"'>" + counter +"</label>");
$("#divTxt").append("<input type='text' size = '60' name='txt[]' value=\'email\' onblur='this.value=email' onfocus='this.value=\"\"''  id= 'txt" + counter +"'></div>");
$("#divTxt").append("<div id='change" + counter +"'>");
$("#divTxt").append("<a href='#' onclick='addFormField();return false;'>+</a>");
$("#divTxt").append("<a href='#' onclick='removeFormField();return false;'>-</a></div>");

if(counter > 1){
$('#change' + (counter -1)).hide();
}


  counter++;

}




function removeFormField() {
$('#field' + (counter)).hide();
$('#change' + (counter)).hide();

$('#change' + (counter -1)).show();


counter--;

}