APEX

Hello All,
I have to use an alert popup for this. Denes Kubicek has a sweet example that I have mimicked also in my actual application.
Section IV - Check Special Character
http://apex.oracle.com/pls/apex/f?p=31517:248:740097222962767::NO
I have created a JavaScript function that pops an alert if any of the specified characters are entered based on CREATE button click.

function charClassName()
{
  var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";

  for (var i = 0; i < document.getElementById('P3_CLASS_NAME').value.length; i++) {
  	if (iChars.indexOf(document.getElementById('P3_CLASS_NAME').value.charAt(i)) != -1) {
  	alert ("Please remove Special characters.");
  	return false;
        }
  }
}

This code works great but I have another function that is being called in the same CREATE button. This other function allows the characters entered to save data to table and also display in Item based on button click. I need help extending my JavaScript to possibly disable the Create button if any of the specified characters are entered and also make sure the button is displayed if not.
My other function is based from this example: http://apex.oracle.com/pls/otn/f?p=48254:2:4259715185364467::NO::P2_EMPNO:7369 that works great also. Click 'New City' which displays the functionality that I have. But I need to also be able to alert an end-user that special characters are not allowed and also not allow them to select the CREATE button and save that data anyway.
I hope this is clear and I also have a example on apex.oracle.com if needed, thanks for reviewing.

Edited by: Charles A on Feb 25, 2010 12:39 PM