disabling submit button not working

Hi All,
I'm calling an external .js file onSubmit to do edit check which returns true if edit check went ok, otherwise returns false if error found in the form.
Now I would like to disable the submit buttons in the same form and send the form data to my servlet (I used post method)once the .js file found no error in the form. But as soon as I disable the submit button, the form data got lost (IE is used, I see a blank screen, and I tried to put break point in the very begining point of the servlet, it did not hit there). What went wrong here?
FYI:
The following is the portion in the jsp file where I call this external .js file:
<FORM name="addcustomer" method="POST" action="/sales/samples/CustomersServlet2"
onSubmit='return verifyForm(this);' >
Here is the portion in the verifyForm(form) function where I tried to disable the submit buttons:
if (!err){
alert("Form has been submitted.");
for(var l=0; l<fm.length; l++){
var elem = fm.elements[l];
if (elem.type.toLowerCase() == "submit")
elem.disabled = true;
}
return true;
}

Please help! Really appreciate!
Soft Music

Soft Music
Welcome to the Java Ranch, we hope you’ll enjoy visiting as a regular however, your name is not in keeping with our naming policy here at the ranch. Please re-register under an appropriate name as shown in the policy.
As for disabling the submit button, what you're doing is disabling the button after is has been clicked and the form has already been submitted. If you're trying to prevent the form from being submitted then what you need to do is return false from the verifyFrom method. Then the form doesn't get submited.
hope that helps

the reason the form is not getting called could be because the form may be checking for a button click. our case it has been disabled already..

Hello Sarran,
You answerd a question that was posted on: January 18, 2002 07:43 AM
I really doubt a person needs an answer right now......
Eric