If you are facing onchange and form submit of select-box (combo box) in html, you are not alone.
In sometimes onchange = “document.formname.submit()” won’t submit the form, while it works on other html pages.
There is hidden truth of this problem is , there may be some other input having the name “submit”. This cause problem in IE and some other browsers. So rename the input field name from submit to any other name (In most case we use the name of submit button as “submit”).
It is a rare tip, you may face this someday !!!