On the Script toolbar (View > Toolbars > Script) there is a circle. Click on the circle and then open a new image. Once you do something, like open a new image, a save icon will be activated on the script tool bar. Click on the save icon and give your script a name. Then in the drop down list choose your script. Then you can click on the run script icon and run your script which, in this instance, will open a new window with the attributes you specified.
There are all sorts of things I've left out, like restricted scripts etc... So you should read the Help section on scripts for a more detailed explantation on how to do scripting. There is also a very handy .pdf file all about scripting that yo should be able to find at the Jasc site.
mike