ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;


	function opwin(url,barra,scrol,ancho,alto){
			open(""+url+"","vent","menubar="+barra+",width="+ancho+", height="+alto+", scrollbars="+scrol+", top="+((winH/2)-(alto/2))+", left="+((winW/2)-(ancho/2))+"")}
	
	function lanza_video(video){
	window.open("video_player.php?video="+video,"video_player","menubar=no, scrollbars=no, status=no, width=320, height=287");
	}