}

	var form = document.adminForm;
	if (form.catid.value == "0"){
		alert( "<?php 
echo html_entity_decode(JText::_('JEV_E_WARNCAT'));
?>
" );
		return(false);
	} else {
		//alert('about to submit the form');
		submitform(pressbutton);
	}
}
<?php 
echo JEventsHTML::buildScriptTag('end');
?>
<table style="width:90%">
	<tr>
    	<td style="font-weight:bold">        <?php 
echo JText::_("Unique_Identifier");
?>
        </td>
        <td><input class="inputbox" type="text" name="icsLabel" id="icsLabel" value="<?php 
echo $label;
?>
" size="80" />        </td>
	</tr>
	<tr>
    	<td style="font-weight:bold">        <?php 
echo JText::_("JEV_CALENDAR_OWNER");