show dimensions

In this field I would like to type in, let's say, 33 and what I would like to show as a result would be, 3' x 3'. Or, if I enter any two digit number the field results would be in feet x feet. Figuring this out is a bit perplexing because I'm talking about a whole numbers and how would I break the number apart, put an x (for by) in between, and show the results in the same field. And, notice the spacing of the results. I have this script and was playing around with it. I got it to put the ' marks in the results. I have to type in the number like this - 3.3. The result is 3'3'. It's close but no cigar. Is it possible to have the field return the results the way I want?

Here's the javascript I'm playing around with:

event.value=this.getField("Footings1").value.toFixed(2).replace(".","' ").replace(/.$/,"' ");