This is what i am trying to accomplish: when the last slide is reached fadeOut last slide and then fadeIn first slide, and then clearInterval (everything works with this part). Now my problem is that i want to setInterval again if it doesn't exists but I don't know how to make it happen:(
I have tried to solve this with if statment but then my script doesn't work at all!
So how can I RESTART my interval again? THANK YOU!!
Without if statement like this it's working fine:

if(!intervalID){

    intervalID = setInterval(animate,5000);

}    

This is what I have so far:

$(document).ready(function() {

  /*check if intervalID don't exists messes UP!!*/

  if (!intervalID) {

    intervalID = setInterval(animate, 5000);

  }



  //Hide everything except first slide and controls



  $('.slidewrap div:not(.slidewrap div:first,.slidewrap .slide_controls)').hide();



  var animate = function() {



    /*if .pagination_active is last removeClass and addClass to .pagination_active 

             first li tag*/



    if ($('.pagination_active').is($('.slide_controls ul li:last'))) {

      $('.pagination_active').removeClass('pagination_active');

      $('.slide_controls ul li:first').addClass('pagination_active');

    } else {

      $('.pagination_active').removeClass('pagination_active').next().addClass('pagination_active');

    }



    /*if div.active is last fadeOut and add .active class 

             to the first div and fadeIn FIRST div then CLEAR INTERVAL and set intervalID to zero */



    if ($('.active').is($('.slidewrap div:last'))) {

      $('.active').fadeOut(1000).removeClass('active');

      $('.slidewrap div:first').addClass('active').fadeIn(1000, function() {

        clearInterval(intervalID);

        intervalID = 0;



      });

    }



    //OR .active fadeOut and next div fadeIn

    else {

      $('.active').fadeOut(1000).next().fadeIn(1000, function() {

        $('.slidewrap div.active').removeClass('active').next('div').addClass('active');



      });

    }



  }



  var intervalID;

  intervalID = setInterval(animate, 3000);



});