Can I custom Popup form? It's so ugly.

When I imput code:

<script type=”text/javascript”>
if (typeof newsletter_check !== “function”) {
window.newsletter_check = function (f) {
var re = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-]{1,})+\.)+([a-zA-Z0-9]{2,})+$/;
if (!re.test(f.elements["ne"].value)) {
alert(“The email is not correct”);
return false;
}
if (f.elements["ny"] && !f.elements["ny"].checked) {
alert(“You must accept the privacy statement”);
return false;
}
return true;
}
}
</script>

<div style=”font-size: 20px;”>Keep the Latest Jordan Release News comming.</div>
<div style=”font-size: 20px; margin-top: 5px;”>Subscribe to our weekly newsletter.</div>

<form method=”post” action=”http://www.23isback.me/wp-content/plugins/newsletter/do/subscribe.php” onsubmit=”return newsletter_check(this)”><!– email –>
<div style=”margin-top: 25px;”><input style=”width: 300px; font-size: 18px; border: 2px solid #CB341F;” name=”ne” required type=”email” value=”Enter Your Email Here.” onclick=”if (this.defaultValue==this.value) this.value=”” onblur=”if (this.value==”) this.value=this.defaultValue” /></div>
<div style=”clear: left; margin-top: 25px;”>
<input style=”font-size: 18px; color: white; background-color: #CB341F; border: 1px solid #CB341F;” type=”submit” value=”Subscribe Now !” />
</div></form>

But It have two form. Ons is default (I don’t need).