<form>
<input type="text">
<input type=submit onsubmit="return fun()">
</form><script>
function fun(){
if (true)
return true
else
return false }
</script>
<input type="text">
<input type=submit onsubmit="return fun()">
</form><script>
function fun(){
if (true)
return true
else
return false }
</script>
function funSubmit()
{
document.form.action=""
document.form.submit();
}