var dragHere = $('.drag-here');
dragHere.css({opacity: 0}).hide();
var busy = false; //Флаг занятости
$('#tool-bar ul').on('mouseenter', function(){
if(!busy){busy = true;
dragHere.show(150).animate({opacity: 1}, 100, "linear", function(){
busy = false;});
}
});
$('#tool-bar ul').on('mouseleave', function(){
if(!busy){busy = true;
dragHere.animate({opacity: 0}, 100, "linear", function(){
busy = false;}).hide(100)
}
})