$(document).ready(function() { 
	var searchClass = ".rechercher";
	var defaultKeyword = '';
	$(searchClass).click(function(){
		if (this.value == 'Rechercher' || this.value == 'Search'){
			defaultKeyword = this.value;
			this.value = "";
		}
	});
	$(searchClass).blur(function(){
		if (this.value == ''){
			this.value = defaultKeyword;
		}
	});
	
});