$(document).ready(function() {
    $(".menuoverstate").each(function(i) {

        preload_image = new Image();
        preload_image.src = this.src.replace(".jpg", "_o.jpg");

        $(this).hover(
            function() {
                if (this.src.indexOf("_o.jpg") == -1) {
                    this.src = this.src.replace(".jpg", "_o.jpg");
                }

            },

            function() {
                this.src = this.src.replace("_o.jpg", ".jpg");

            });

    }
        );
});



var coursesStates = { "menuCourses": false, "menuCoursesDropDown": false };

var TRANSITION_SPEED = 100;

function checkCoursesMenu() {

    if (coursesStates["menuCourses"] == false && coursesStates["menuCoursesDropDown"] == false) {
        jQuery("#menuCoursesDropDown").slideUp(TRANSITION_SPEED);

    }
}


jQuery(document).ready(function() {

    // Courses menu dropdowns //

    jQuery("#menuCourses").hover(function() {
        coursesStates["menuCourses"] = true;

        var src = jQuery("#menuCourses").attr("src");

        if (coursesStates["menuCoursesDropDown"] == false) {
            jQuery("#menuCoursesDropDown").slideDown(TRANSITION_SPEED);
        }
    },

function() {
    coursesStates["menuCourses"] = false;

    setTimeout("checkCoursesMenu();", 100);
});


    jQuery("#menuCoursesDropDown").hover(function() {
        coursesStates["menuCoursesDropDown"] = true;



    },
    function() {
        coursesStates["menuCoursesDropDown"] = false;
        setTimeout("checkCoursesMenu();", 100);
    });

});