Mixing asp and Javascript

[Bombdrop]

Hi all and hats of to all you scripter i'm find it bloody hard.

i wish to assign a Javascript variable to my asp code .
I can get the data out but how do i get it in

var x=18;
<%
temp 
%> = x;

not a good example but i wish temp stored in my ASP to be assigned to x a variable in my HTML javascript side. Can anyone help this idiot???