JS validation inside CFWindow

I am attempting to use javascript to validate a form inside of a cfwindow.

The form is loaded from another page... I have tried putting the script on the imported page as well as the page calling the CFWindow.

My js function is formed correctly to my knowledge...checkAttend = function(){}

//main calling page//

checkAttend = function(){
      f = document.getElementById("attendForm");

     alert("test");

}

//cfwindow//

<form action="" onsubmit="return checkAttend()" method="post" id="attendForm">