This function opens a window of specified size:

function newWindow () { 'response.html','','height=100,width=200,left=450,top=300');

Instead of having alert pop up window, I have the above function to open a window with a message.

With alert box, the user will not be able to go to the main window until 'OK' button is clicked. How do I implement that in the above function to have the same functionality?