html - Javascript onchange different in IE and FireFox -

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when onchange event in ie returns false, ie focus stays on input box. in firefox focus moves next field regardless.

html: 

input name="seminar_donation" type="text" id="seminar_donation" onchange="return checktotal(this);"

javascript: 

function checktotal(inputbox) {       if (isnan(parseint(inputbox.value))) {            alert("please enter digits 0-9");            inputbox.focus();            return false;       }       return true;   }

in ie don't need inputbox.focus() unfortunately not appear in firefox retain focus on errant input box. how can firefox stay on input box?

settimeout('document.getelementbyid("seminar_donation").focus()',1);

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