function set_search_action(form){
	var keywords=form.searched_keywords.value;
	keywords = keywords.replace(' ', '-');
	keywords = keywords.toLowerCase();
	form.action = form.action+keywords+',1.html';
}

function clear_input(elem, default_value){
	if(elem.value == default_value)
		elem.value = '';
}

function check_filled(elem, default_value, msg){
	if(elem.value == '' || elem.value == default_value)
		alert(msg);
}