Actionscript external interface onload

Hi
I Have this external interface code that sends a video url to a video player when a user clicks a button it goes some thing like this:
<script language="JavaScript" type="text/javascript">
$(document).ready(function() {
function callJavascript(sendText){
window.document.myMovie.SetVariable("testValue", sendText);
</script>
The code above works fine when a user click a button with onclick the passed variable is a video url
and is send to the player.
The problem is I would like to get the video url passed when the page is loaded.
I have tried.
<script language="JavaScript" type="text/javascript">
$(document).ready(function() {
var sendText=$("Videosroll/Videos/1.flv").val();
window.document.myMovie.SetVariable("testValue", sendText);
</script>
This does not work. I think its because the videoplayer is not fully loaded when this action is called.
I have looked at javascript timers etc. If any one has a solution please help.

Hi
This is extremely helpful. My current actionscript is:
var testValue:String = "";
watchCallback = function (id, oldval, newval):String {
    result_txt.text = newval;
    myVid.play(newval);
    return newval;
_root.watch("testValue", watchCallback);
HTML/PHP:
<?Php
//This is a while loop with many videourls and thumb images. When clicked the javascript passes the video url to flash.
<a href="" onclick="return false" class="gt" name="'.$vidfield.'"><img src="'.$vidthumb.'" width="180" height="105" align=center /></a>
?>
Current javascript:
<script language="JavaScript" type="text/javascript">
$(document).ready(function() {
    $(".gt").live("click", function(){
        var sendText = $(this).attr("name");
        window.document.myMovie.SetVariable("testValue", sendText);
</script>
The attempt is to automaticly send the a video url onload. So using your advice I added this to current code:
HTML:
<body onload="callnow(videourl)"></body>
Javascript:
<script language="JavaScript" type="text/javascript">
$(document).ready(function() {
function callnow(videourl){
return videourl;
</script>
Actionscript 2.0:
import flash.Exteneral.ExternalInterface;
var videoURL:String=ExternalInterface.call("callnow");
//Videoplay called myVid.
myVid.play(videoURL);
This has failed to play the video url onload. Other effort include changing callnow function to:
function callnow(videourl){
window.document.myMovie.SetVariable("videoURL", videourl);
return videourl;
This has not been a success. I hope you can help and thank you again.

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Actionscript external interface onload

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