รบกวนดูโค้ด javascript ให้หน่อยครับ มีปัญหาเกี่ยวกับความปลอดภัย

$(".btn").click(function() 
		{
			var keyword = $(".search_input").val();
			postLink = { 'keyword': keyword , 'senduser_id' : <?=$user_id?> };
			$.ajax({
					 	  url: 'add_keyword.php',
					 	  type: 'POST',
					 	  data: postLink,
					 	  dataType: 'html',
					 	  success: function(data) {
					 	  		
					 	  }
					   });	
		
		
			var search_input = $(".search_input").val();
			var keyword= encodeURIComponent(search_input);
			// Youtube API 
			var yt_url='http://gdata.youtube.com/feeds/api/videos?q='+keyword+'&format=5&max-results=9&v=2&alt=jsonc'; 
			//alert(yt_url);
			$.ajax
			({
				type: "GET",
				url: yt_url,
				dataType:"jsonp",
				success: function(response)
					{

					if(response.data.items)
						{
							$(".videos").html('');
						//alert('x');
								$.each(response.data.items, function(i,data)
								{
									var video_id=data.id;
									var video_title=data.title;
									if(video_title.length>30)
										video_title=video_title.substr(0,30)+"...";
									var video_viewCount=data.viewCount;
									// IFRAME Embed for YouTube
									var video_frame="<iframe width='320' height='190' src='http://www.youtube.com/embed/"+video_id+"' frameborder='0' type='text/html'></iframe>";

									var final="<li><div id='title'>"+video_title+"</div><div>"+video_frame+"</div><div id='count'>"+video_viewCount+" Views</div><input type='button' value='Add to My Playlists' lb='"+video_id+"' class='btn btn-primary' onclick='add_playlist(\"add_playlist_new.php?sendlink="+video_id+"&senduser_id=<?=$user_id?>\",550,350);' /></li>";
									$(".videos").append(final); // Result
								});
						}
						else 
						{
							$(".videos").html("<div id='no'>No Video</div>");
						}
					}
			});
		});

});