If you are using JW FLV PLayer then you can to it with parameter
'controlbar': 'none',
Example:
<code>
<script type='text/javascript' src='jwplayer.js'></script>
<div id='mediaspace'>This text will be replaced</div>
<script type='text/javascript'>
jwplayer('mediaspace').setup({
'flashplayer': 'player.swf',
'file': 'flvfile.flv',
'controlbar': 'none',
'width': '470',
'height': '320'
});
</script>
</code>