JS: What does this code need to validate & submit (not 1 or the other)

<input type="button" value="Add" onclick="submit()" />
[/html]
Any suggestions for the syntax to use so the form is checked when submit is pressed, stops submit if there's an empty field then allows me to submit again?

Do you mean this:

[html]<input type="submit" value="Add Observations" />[/html]

because that won't let me submit the form even if its ok

The problem seems to be that even if the JS function finds an empty field and displays an alert box it will submit the form when you click 'ok'.

I need the function to let me correct the error then submit the form

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1.     if(isEmpty(valp, "Please enter a value"))
2.     {
3.         return true;
4.  
5. function isEmpty(elem, helperMsg)
6. {
7.     if(elem.value.length == 0)
8.     {
9.         alert('Please Enter a Value');
10.         elem.focus();
11.         return true;
12.     }
13.     return false;
14. }

what changes here will enable this?