User-defined function to compare value to a table and display corresponding value

Hello, All. When I couldn't figure out how to get excel to do the things I wanted in a cell, I wrote a macro in VBA, which I'm sure is full of problems, but, with no previous experience in VBA and only programming experience in Fortran 77- haha- I am unable to diagnose the issues. I am grateful to anyone who can take a look see. It could very well be that I don't need a macro for the formula. If I do, what's wrong with mine?

I will describe the issue in terms of a single cell, since I believe it makes the objective more clear, and since one working cell will get them all working. I want G3 to compare E3's value to the values of the I-column rows and return the corresponding J-column value of the I-column value closest to that of E3. (You'll notice in my macro that I crudely simplified the program to return the higher of the J-column values of the I-column values that E3 lies between, which is fine, too).

The table (the I and J columns) was copy+pasted into the spreadsheet, which might be part of the problem.

The reason I want G3 to be formulated/programmed is so that B and C columns can be user-edited at any time. Obviously, looking up five values on a table on the same page is not the issue. I would like to be able to have many rows of values, if I wanted, making an auto-instant-evaluation-and-answer quite a useful tool, as well as the general engineering brain that just won't let me have a moment's peace until I solve this problem.

ps The formula in G3 now was just a test for a simple IF statement-- please ignore. Press alt+F11 to look at macro. It is under Modules in the tree. Thank you!