$(document).ready(function(){
  defaultFormValues('#s', 'zoeken');
  defaultFormValues('#message', 'Max 140 karakters');
});

function defaultFormValues(sel, default_text) {
	var el = $(sel);
	if (el) {
		if (el.val() == '') {
			el.val(default_text);
			el.addClass('placeholder');
		}
		el.focus(function(){
			if (el.val() == default_text) {
				el.val('');
				el.removeClass('placeholder');
			}
		});
		el.blur(function(){
			if (el.val() == '') {
				el.val(default_text);
				el.addClass('placeholder');
			}
		});
	}
}