Can anyone tell me how to convert a javascript variable value to ASP variable?

In JSP I have:

<script language="JavaScript">
function sublist(inform, selecteditem) {
.
.
.
var number = document.subad.number.value

'And now I need to do some database stuff and the "number" value in ASP.
.
.
.
<%
numberASP = ???
Set R = objDB.Execute("SELECT * FROM db WHERE number = " & numberASP)
.
.
.
%>
.
.
.
}
</script>

Or is there an other way to do that database query? Can I use JSP variable in ASP code? How?

Hope you get the point .