function openPlayer(theFile){
	url = 'media/player.php?f=' + theFile; 
	leftPosition = (screen.width) ? (screen.width-240)/2 : 0;
	topPosition = (screen.height) ? (screen.height-100)/2 : 0;
	params = 'width=240,height=100,top='+topPosition+',left='+leftPosition;	
	window.open(url,'player',params);
}