$(document).ready(function()
{

  $(".ServiceContent").hide();
  
  $(".Service_Header").click(
    function()
    {
        $(this).next(".ServiceContent").slideToggle(700);
         var $this = $(this);
         if( $this.is('.Service_Header') ) {
            $this.removeClass('Service_Header');
            $this.addClass('ServiceContentOpen');
         }
         else{
            $this.removeClass('ServiceContentOpen');
            $this.addClass('Service_Header');
         }
    }
  );

});