[jQuery] select form problem

[jQuery] select form problem

I got a small but annoying problem (still jquery 1.0.4 (old site))
Note the following code:
$("li#coffee_morning").click(function(){
    var people = $("#people").attr("value");
    $("select#s_morning option:eq(" + people + ")")[0].selected = true;
//    $("select#s_morning option:eq(" + people + ")").attr("selected",
"true");
    $("li#coffee_morning select").css({display: "block"});
});
The code looks at a select and want to make other select automaticaly
change the value.
With the following this works:    $("select#s_morning option:eq(" + people
+ ")")[0].selected = true;
however then you can't change the setting of the select#s_morning
if I use the attr $("select#s_morning option:eq(" + people +
")").attr("selected", "true");
Then the selected will show up in the html code but won't show in the
browser that this is the selected item.
How can I solve this problem
Thanxs
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