Help me check 2 fields and then show final number

Question

I'm very new to JavaScript and need a little help with a function.
I need to have JS check to make sure 'Equipment Description' and 'Equipment Serial' are filled out before showing a field named 'Incentive'. My hope is that if the fields are NOT filled out that it will then give an app.alert('Please enter an equipment serial number').
I had originally started a different way and this was as far as I got if that helps anyone. (the first 2 lines are used because there are many rows of information that can be gathered - this was from a previous developer who is no longer on our team ) The issue is that they are seperate and I need it to check for both and obviously it doesn't tell the incentive field to do anything as far as visibility goes. I am file starting from scratch and not using this code.
function getcheck() {
var rowName = event.target.name;
var rowNum = rowName.substr(rowName.length-5,5);
if (this.getField("Equipment Description"+ rowNum).value == " ") {
     app.alert('Please enter an equipment description');
if (this.getField("Equipment Serial"+ rowNum).value == " ") {
     app.alert('Please enter an equipment serial number');
Any help is appreciated.

Answer 1

In case clicking over to the original thread is too much work...
And your question is...?
Are you asking someone to just do your homework for you? If not, then what particular part are you having trouble with? We're not going to read your mind.
You should be able to at least make a start on this assignment. If you can't, then either you haven't been paying attention in class, or you don't have much ability in this area or your instructor is giving assignments that are way beyond the level of what he's teaching. Whichever of these it is, it's beyond the scope of this forum to address it--you'll have to deal with it.
If you've done some work, then post it (in and tags) and explain specifically what troubles you're having.