a quick way coudl be like this (just put it all in an asp page, i think it should work hvent tested it)

<%
strHello = "Hello World"
%>

<script language=javascript>
if (window.print) {
agree = confirm('<%= strHello %>');
if (agree) {window.location.href = 'default.asp'}
}
</script>

I want to transfer all java code to asp code

Firstly, asp is not code, asp is an engine for interpretting code and can be written in vbscript or javascript, however generally where there is a mix of vbscript and javascript it is done for a simple reason, the vbscript runs on the server and the javascript runs in the browser, so you can't rely replace the javascript as it would no longer function in the same way. So please explain why you are wanting to do it ?

What is happening to trigger this event?
Is it on page load, when a form is submitted, etc?
Because ASP runs at the server you can't trigger these things without reloading the page. Hence the reason for JS. JavaScript runs client side and can detect something like a form field value on change. For asp to do this you have to submit it.

So the context is important.