Event.observe(window, 'load', form_check, false);

function form_check() {
     Event.observe('search_button', 'click', wikipedia_search, false);
}

function wikipedia_search(){
     var url = 'includes/wiki_search.php';
     var pars = 'search_word_val='+escape($F('search_word_val'))+'&search_array_index='+escape($F('search_array_index'));
     var target = 'search_results';
     var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
     
    $("search_array_index").value = '';
 	$("search_suggestions").innerHTML = '';
 	$("wiki_help").innerHTML = '';
 	$("wiki_loading").innerHTML = '<img src="images/loading.gif" alt="Loading..."/>';
 	 	
 	setTimeout("$('wiki_loading').innerHTML = ''", 1000);
 	
	Effect.Pulsate('search_results', {pulses:1, from:0.3, duration:1.5});
}