Preselecting a value in a dynamic selection box

Hi I have a selection box that is dynamically filled by choosing a value from another selection box. So for instance:

List of Continents
List of Countries
List of States

Now I am building a page that is about a country so I want the Continent and Countries box to be preselected and the States list to be filled with the values depending on the selected country.

How can I preselect an item from the countries list if it is dynamically created by the continents list. How can I in general select a value from a selection box?

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<select name = "myselect">
<option selected>option1</option>

This is preselected
when the page loads dynamically u can have a javascript like this

function initselect()
 for (var i=0;i<selectboxname.options.length;i++){
    if (selectboxname.options[i].value=='theoptionvalue_which_u_want_selected')
      selectboxname.selectedIndex = i;

and u can call the initselectfunction
in <body onload = "initselect()">

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see this example
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
function dynamicsel()
var a= document.myform
var opt = new Option("USA","USA","USA")
var opt1 = new Option("INDIA","INDIA","INDIA")
var opt2 = new Option("UK","UK","UK")
a.mysel.options[0] = opt1
a.mysel.options[1] = opt
a.mysel.options[2] = opt2
function dyninit()
var a = document.myform
for(i =0; i<a.mysel.length; i++)
if(a.mysel.options[i].value == "USA")
a.mysel.options[i].selected = true;


<BODY onload = "dynamicsel();dyninit();">
<form name = "myform">
<select name = "mysel">
another simple way without to modifiy other script:

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