OnSubmit grab external file and read a variable

This variable would determine if submit should return true or false

[otem]

On a form submit, is it possible to get a value from another page, and then produce an if/else condition in javascript to see if the submit should continue or not?

Something like this:

user types in a value and presses submit
onsubmit javascript requests a file based upon that inputed value (something like input.js)
if input.js' var continue=true, submit form
else return false

Thanks

[humpg]

Could you not just include the JS file in the page with the form and check the variable....