Hallo,
<form action="..." onsubmit="return chkBackup(this)">
function chkBackup(form){
if(form.backup.checked == 1 && form.BackupName.value == "") {
...
die Abfrage wäre so sinnvoller
~~~javascript
if (! form.backup.checked || form.BackupName.value=="" ) {
alert ( ...)
return false;
}
Gruß plan_B
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