Last step of checkout doesn't work

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.2
-- PHP version -- : 5.4
-- Browser(s) name and version -- : any
-- Error-message(debug-mod must be tuned on) -- : no error msg

Hello,

i want to go online with my online shop as soon as possible. Several weeks ago I checked the checkout process and the process with paypal / cash worked really fine.

But now in my final tests I see the last step ("buy" btn) of the process doesn't work and i can't find the failure.

Description:
All steps of the process I can follow (payment, deliver) but the last step with the "buy" btn has no effect. The website switches to the next step but the page from the last step shows up, without any messages. The messages-Function is working.
I configured 4 steps for the checkout process. (step-0,step-1,step-2,step-3). In step-3 is the "buy" btn. To this step-3 is is everythink ok.
But:
if I click the "buy" btn the url change to step-4. But nothing happen. I tested all payment methods and delivery methods.

I hope you can help me very soon.

cheers
Daniel

Edit:

I found in the debugger that the methode hikashopcheckmethods() not referenced.

[b]<!--[/b]

function isSelected(radiovar){
	if(radiovar.checked){
		return true;
	}
	for(var a=0; a < radiovar.length; a++){
		if(radiovar[a].checked && radiovar[a].value.length>0) return true;
	}
	return false;
}

function hikashopCheckMethods() {
	var varform =  document["hikashop_checkout_form"];

	if(typeof varform.elements["hikashop_payment"] != "undefined" && !isSelected(varform.elements['hikashop_payment'])) {
		alert("Bitte füllen Sie die Zahlungsinformationen aus");
		return false;
	}

hi nicolas,

thank you for your answer.

For any other mistakes I am using a javascript loader. This loader striped some javascripts included yours.
Now its working.

I have some other issues but for this i will open a new topic:
-For example i have a different css beavior then a hikamodul loaded

Thank you