function show_pop(divName){
$('#pop_bg').css("opacity","0.7");
$('#pop_bg').fadeIn("50000");
$(divName).fadeIn("50000");
}

function close_pop(divName){
$('#pop_bg').fadeOut("50000");
$(divName).fadeOut("50000");
}

$(window).resize(function(){
$('#pop_bg').css("height","100%");
});