how can i creat class using Jquery

how can i creat class using Jquery

Im new at jquery script im trying to create a simple modal popup window this is my script can somebody help me?
  2. var box = function(h, w, content) {
  3.       this.h = h;
  4.       this.w = w;
  5.       this.content = content;
  6. }

  8. $.extend(box.prototype, {
  10.       showmybox: function() {
  11.   if(popupStatus == 0){
  12. $("#win").css({
  13. display: 'block',
  14. width: w,
  15. height: h,
  17. left: ($(window).width()/2 - w /2),
  18. top: ($(window).height()/2 - h /2) 
  19. });
  20. $('#bb').addClass('modalOverlay');
  21. $("#win").append(content).show(200);
  22. popupStatus = 1;
  23.   }
  24.       },
  25.  
  26.       closemybox: function() {
  27.             if(popupStatus == 1){
  28. if(e.target.idName !== "win")
  29. {
  30.  $("#win").hide(100);
  31.  $('#bb').removeClass("modalOverlay");
  32.  popupStatus = 0;
  33.  return false;
  34. }
  35. }
  36.       }
  37. });
now how can i call it