(function()
    {

        changeSubMenu = function (blocks,el)
        {

                blocks.eq(el).show();
        }

        hideSubMenu = function (blocks,el)
        {
                blocks.eq(el).hide();
        }
    }
)();
$(document).ready(function(){

    var blocks = $('#blocks > div');
    var menu = $('.main_menu_header li a.p1');

    menu.mouseover(function(){
        changeSubMenu(blocks, menu.index($(this)));
    }).mouseout(function(){
        hideSubMenu(blocks, menu.index($(this)));
    });
    blocks.mouseover(function(){
        $(this).show();
        var num_el = blocks.index($(this));
        menu.eq(num_el).addClass('hover_menu');
    }).mouseout(function(){
                var num_el = blocks.index($(this));
        menu.eq(num_el).removeClass('hover_menu');

        $(this).hide();
    });
});