function validator() {
if (!document.getElementById("shop-addentry")) { return false; }
var form = document.getElementById("shop-addentry");

form.onsubmit = function() {
var errors = 0;
$('#shop-addentry li.error span').remove();
$("li").removeClass("error");

var name = document.getElementById("name");
if(name.value === '') {
errors[errors++]
$(name.parentNode).addClass("error").append('<span>Shop-Name fehlt</span>');
}

var url = document.getElementById("url");
if(url.value === '') {
errors[errors++]
$(url.parentNode).addClass("error").append('<span>URL fehlt</span>');
}

var email = document.getElementById("email");
if(email.value === '') {
errors[errors++]
$(email.parentNode).addClass("error").append('<span>E-Mail fehlt</span>');
} else {
if (!validEmail(email.value)){
errors[errors++]
$(email.parentNode).addClass("error").append('<span>Sie haben eine falsche E-Mail Adresse eingegeben</span>');
}
}

if (errors != 0) {
return false;
}
}
}

$(document).ready(function(){
validator();
});