diff --git a/js/id_highlighter b/js/id_highlighter
new file mode 100644
index 00000000..60052031
--- /dev/null
+++ b/js/id_highlighter
@@ -0,0 +1,40 @@
+Array.prototype.remove = function(v) { this.splice(this.indexOf(v) == -1 ? this.length : this.indexOf(v), 1); }
+
+var idshighlighted = [];
+
+function getPostsById(id){
+	return $(".poster_id").filter(function(i){
+		return $(this).text() == id;
+	});
+}
+
+function getMasterPosts(parents){
+	if(!parents.hasClass("post")) return;
+	
+	var toRet = [];
+	
+	$(parents).each(function(){
+		if($(this).hasClass("post"))
+			toRet.push($(this));
+	});
+	
+	return toRet;
+}
+
+$(".poster_id").click(function(){
+	var id = $(this).text();
+	
+	if($.inArray(id, idshighlighted) !== -1){
+		idshighlighted.remove(id);
+		
+		$(getMasterPosts(getPostsById(id).parents())).each(function(i){
+			$(this).removeClass("highlighted");
+		});
+	}else{
+		idshighlighted.push(id);
+		
+		$(getMasterPosts(getPostsById(id).parents())).each(function(i){
+			$(this).addClass("highlighted");
+		});
+	}
+});