$(document).ready(function () {
    $('#main-nav-menu li a').mouseover(function () {
		var currentId = $(this).parent().attr('id');
		if (String(currentId)!="") {
			//alert (currentId);
			currentId = '#'+currentId+' .sub_menu';
			$(currentId).css('border-top','1px solid #b5b5b5');
			$(currentId).slideDown(300, 'linear');
		}
    });
    $('#main-nav-menu li').mouseleave(function () {
		var currentId = $(this).attr('id');
		if (String(currentId)!="") {
			//alert (currentId);
			currentId = '#'+currentId+' .sub_menu';
			$(currentId).css('border-top','1px solid #F7F7F7');
			$(currentId).slideUp(300, 'swing');
		}
    });	
});