$(document).ready(
	function() {
		$('#recherche_champ').focus(
			function() {
				this.select();
			}
		);
		
		$('#recherche_champ').blur(
			function() {
				if(this.value == '')
					this.value = Drupal.t('Search this site');
			}
		);
		
		$('#rechercheBlock > form').submit(
			function() {
				var expressionRecherche = this.q.value;
				
				if((expressionRecherche == '') || (expressionRecherche == Drupal.t('Search this site'))) {
					alert(Drupal.t('Please enter some keywords.'));
					this.q.select();
					return false;
				}
				else
					return true;
			}
		);
	}
);