$(".external-link").click(function(e){ //on external link click
    e.preventDefault(); //cancel immediate redirect of link
	
    $("#modal") //selecting modal window div
      .data('href', $(this).attr('href')) //saving href to modal window itself
      .modal(); //showing modal window
});
	  
	  $("#yes").click(function(){window.location=$("#modal").data('href')}); //if user clicks yes, redirect