javascript - How to set default value for HTML select?

I have a HTML select like this:

            a
 b

            c

and
I have a variable named temp in my JavaScript:

var temp =
            "a";

Now I want to set
the value of the option that is equal to temp as default value for my
select.

How can I do it?

Answer

$(function()
            {

 var temp="a"; 

            $("#MySelect").val(temp);
});

            id="MySelect">
 a

            b
             value="c">c