function showHideForm () {
		var parent=$('#menuPrincipal').offsetParent;
	 	$('#titreReserve').click(function(){
	 		if ($("#cadreReserve").is(":animated")) { 
	 		           return; 
	 		       }
			var TopEl = $('#menuPrincipal').find('#8').offset();
			if ($("#cadreReserve").offset().top>(TopEl.top+42)) {
					$("#cadreReserve").animate({"top":'-=46px',"height":"+=100px"},500);
					$('#hoverBg').animate({'opacity':'0'},1500);
					}
					
			else	{
				 	$("#cadreReserve").animate({"top":'+=46px',"height":"-=100px"},500);
				 	if (opacityHover==1)
				 	$('#hoverBg').animate({'opacity':'1'},1500);
				 	}
 	});
}