function start_video(title,video_id,_width,_height)
{
	var w = (_width == undefined)  ? 640 : _width;
	var h = (_height == undefined) ? 505 : _height;
	var m = 0;
	var output = '';
	if(!$('#videothumb_dialog').length)
	{
		var dialog = document.createElement('div');
		$('body').append(dialog);
		$(dialog).attr('id','videothumb_dialog');
		$(dialog)
			.dialog({
				autoOpen: false,
				closeOnEscape: true,
				dialogClass: 'videothumb_dialog',
				modal: true,
				stack: false,
				resizable: false,
				width: w + 60
			});

		$(dialog)
			.html(
				'<div id="cls_btn_video"><a href="#">X</a></div>'+
				'<h1 id="video_title"></h1>'+
				'<div id="youtube_load_video"></div>'
			);

		$('#cls_btn_video a, .ui-widget-overlay').live('click',function(){
			$('#videothumb_dialog').dialog('close');
			$('#videothumb_dialog').remove();
			return false;
		});

	}
	output = '\
		<div style="padding:0 ' + m + 'px;"> \
			<object width="' + w + '" height="'+h+'"> \
				<param name="movie" value="http://www.youtube.com/v/' + video_id + '&hl=en&fs=1&autoplay=1&rel=0"></param> \
				<param name="allowFullScreen" value="true"></param> \
				<param name="allowscriptaccess" value="always"></param> \
				<embed src="http://www.youtube.com/v/' + video_id + '&hl=en&fs=1&autoplay=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="' + w + '" height="' + h + '"></embed> \
			</object> \
		</div>';
	$('#videothumb_dialog #youtube_load_video')
		.html(output);
	$('#video_title')
		.text(title);
	$('#videothumb_dialog').dialog('open');
}