$(function() {
	$('div#search form').submit(function() {
		var field = $(this).find('input#tx_htdig_search');
		
		return field.val() != '' && field.val() != field.attr('defaultValue');
	});
	
	$('div#content div.tx-htdig-pi1-searchbox form').submit(function() {
		var fieldKeywords = $(this).find('input#tx_htdig_keywords');
		var fieldAnd = $(this).find('input#tx_htdig_and');
		var fieldNot = $(this).find('input#tx_htdig_not');
		
		var fieldKeywordsFilled = fieldKeywords.val() != '' && fieldKeywords.val() != fieldKeywords.attr('defaultValue');
		var fieldAndFilled = fieldAnd.val() != '' && fieldAnd.val() != fieldAnd.attr('defaultValue');
		var fieldNotFilled = fieldNot.val() != '' && fieldNot.val() != fieldNot.attr('defaultValue');
		
		if (fieldKeywordsFilled || fieldAndFilled || fieldNotFilled) {
			return true;
		}
        
        alert('Er is geen zoekterm ingevuld');
		
		return false;
	});
});