obligatoriska fält, icke obligatoriska fält

<script type="text/javascript">

function cFields(fObj) {
    var msg = [];

    if ( fObj.elements[ "force_t1" ].value == "yes" )
	if ( fObj.elements[ "t1" ].value == "" )
	    msg.push( "Du måste fylla i fält 't1'" );

    if ( fObj.elements[ "force_t2" ].value == "yes" )
	if ( fObj.elements[ "t2" ].value == "" )
	    msg.push( "Du måste fylla i fält 't2'" );

    if ( msg.length > 0 ) {
	alert( msg.join( "\n" ) );
	return false;
    }

    return true;
}

</script>

<form name=f1 OnSubmit="return cFields(this);">
<input type=text name=t1>
<input type=text name=t2>

<input type=hidden name="force_t1" value="yes">
<input type=hidden name="force_t2" value="yes">

<input type="submit">

</form>

:)

funkar klockrent, tack för hjälpen :bire