new ideal easy payment plugin

I'm trying to make a new payment plugin.
How can I implement this as simple as possible, looks a bit like Bluepaid (paying with your bank card).
The ABNAMRO Bank provides the code as stated beneath.

The var Amount has to be determined by the shop software
PSPID = shop id


<!-- CODE_START -->

<script type="text/javascript">
<!-- Begin

var Amount = 123;
var PSPID = "TESTiDEALEASY";
var AM;

if (isNaN(Amount))
{
alert("Amount not a number: " + Amount + " !");
AM = ""
}
else
{
AM = Math.round(parseFloat(Amount)*100);
}

var orderID = "1";
mydate = new Date();
tv = mydate.getYear() % 10;
orderID = orderID + tv;
tv = (mydate.getMonth() * 31) + mydate.getDate();
orderID = orderID + ((tv < 10) ? '0' : '') + ((tv < 100) ? '0' : '') + tv;
tv = (mydate.getHours() * 3600) + (mydate.getMinutes() * 60) + mydate.getSeconds();
orderID = orderID + ((tv < 10) ? '0' : '') + ((tv < 100) ? '0' : '') + ((tv < 1000) ? '0' : '') + ((tv < 10000) ? '0' : '') + tv;
tvplus = Math.round(Math.random() * 9);
// End -->
</script>
<style type="text/css">
label {width: 120px; text-align: left;}
button.iDEALeasy {background-color: #FFFFFF;}
</style>



<form method="post" action=" internetkassa.abnamro.nl/ncol/prod/orderstandard.asp " id="form1" name="form1">
<script type="text/javascript">
document.write("<input type=\"hidden\" NAME=\"PSPID\" value=\"" + PSPID + "\" />");
document.write("<input type=\"hidden\" NAME=\"orderID\" value=\"" + (orderID + ((tvplus + 1) % 10)) + "\" />");
document.write("<input type=\"hidden\" NAME=\"amount\" value=\"" + AM + "\" />");
</script>

<input type="hidden" name="currency" value="EUR" />
<input type="hidden" name="language" value="NL_NL" />
<input type="hidden" name="PM" value="iDEAL" />
<button class="iDEALeasy" type="submit" name="submit1" value="submit">
Betalen met<br />
<img src=" internetkassa.abnamro.nl/images/iDEAL_easy.gif " alt="iDEAL" />
</button>
</form>
<!-- CODE_END -->

I created an iDEAL Payment module already for HS 1.5.3 and J! 1.7
(remember that the iDEAL Easy variant is not the best option for webstores BTW)

If interested, PM me.

Hey there Exists a Internetkassa ABN Amro Module: www.customweb.com/shop/en/hikashop-payment-plugin-abnamro.html