Javascript: Array generated Dropdown with video change.

[Exking]

Hello, i am all new to this kind of stuff and i didnt find any topic yet about it because i do not really know how to call this problem. So if there are any solutions yet i am sorry for opening a new topic.

I want a dropdown navigation, that read its content out of an array.
best would be if the array could read its content out of a .txt file but i know that this is kinda impossible via javascript.

But there is gonna be a special part about the dropdown. Above the dropdown there is a embeded youtube video.
This is a randomly shown youtube video, by letting php generate a random number, picking a video-link out of the array-file and putting the link into this embeded code.

NOW^^ if the user chooses a link in the dropdown it should change the above video code by putting in not the random number but the choosed one.

I hope you understood what i was trying to ask

Thats what i got so far...its all PHP i know, but i do not know how to realize it with javascript, thats why i ask it here.

<?php

$video_array = file('vid.txt');
$zahl_array = file('zahl.txt');
$anzahl = count($video_array);


// random zahl f&#252;r alle arrays gleich
$num = rand(0, count($video_array) - 1);
$video = $video_array[$num];
$zahl = $zahl_array[$num];

//Trimmen
$zahl = trim($zahl);
$video = trim($video);

?>

<table border="0" width="100&#37;">
	<tr>
		<td width="100%" align="center" colspan="1">

<--In here should be either the random video which is standard, or the choosed video by the user-->

<object width="540" height="345"><param name="movie" value="http://www.youtube.com/v/<?echo $video;?>"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/<?echo $video;?>" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="205" height="150"></embed></object><br><b>Playing video nr. <? echo $zahl; ?> of <? echo $anzahl; ?></b>
    </td>
  </tr>
  <tr>
  	
  	<td width="50%" align="center">Choose a video            
     <FORM name="drop_list" method="POST" >

    <SELECT NAME="Vide">
    <Option value="" >Video Liste</option>
<--In here should be the generated Options out of the arrayfile-->
    </SELECT>
    </form>
     
  	</td>
  </tr>
</table>

Sry for my bad english i am from germany

[Exking]

OK so it seems that this topic is not clearly enough i wanna formulate my question a bit different now.

Thats my generated Dropdown out of a array.

<?
    	echo '<select name="myselect" onChange="vidchange()">';

for($i = 0; $i < count($zahl_array); $i++)
{
echo '<option value="'.$i.'">'.$zahl_array[$i].'</option>';
}

echo '</select>';
?>

I need the function vidchange. That should get the choosed value. Then it should formulate a link like this.

<object width="540" height="345"><param name="movie" value="http://www.youtube.com/v/----VALUE----"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/----VALUE----" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="205" height="150"></embed></object>

The value that is given to the function corresponds to a link-fragment in array.

I hope someone can help me.