Talk:Adding Two Numbers - JS

The error checking code is not working, at least on my computer. I tried the isNaN in a simple app with just a text box and button but it would not work. I tried copying the code in the tutorial but that didn'w work either. If I typed in one number and nothing in the other box, I simply got NaN in the Total box, but no alert. Any idea what I am doing wrong? Is it just me?

Thanks ANdy