Ah ha!

I think that means it's failing to find the element with that ID. Not sure why this is happening, but at least you can add an object detect to avoid the error:

Code: Select all

var x = document.getElementById("submit")
if (x) {
x.onclick=function(){mailIt(this.form); document.mailform.captchastring.value=(''); return checkForm();}
}

This may not actually make it work, but at least it will stop the error message (for pages that lack this element).