>I am trying to accomplish a coding system lookup in a browser based system. What I would like to do is to pop up another window, do some queries and such to get a small list of possible codes, and have the user click on the one they want and have it fill in the field on the calling form while closing the child window. Perfereably something that will work with both IE and Netscape.
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>This seems to be really hard to do.

You have to instantiate an object in Javascript which could be a reference to your field. Then, on selection of the item in the other form, you just replace the window.opener.loObject.value with the value you have determined. Then, just close the form with window.close(). That's one way to do it. You may view the code I am using here when you select a member for example.