bootstrap modal centering and resizing

gistfile1.txt

$j('.modal').on('show.bs.modal', function(e) {
	    var modal = $j(this);
	    var modalContent = $j(this).find('.modal-content');
	    var modalDialog = $j(this).find('.modal-dialog');
	    //If the modal is too tall, resize it
	    if($j(modalDialog).height()>=$j(window).height()){
  			$j(modalDialog).height($j(window).height()-20);
  		}
	    //If the modal is too wide, resize it
  		if($j(modalDialog).width()>=$j(window).width()){
  			$j(modalDialog).width($j(window).width()-20);
  		}
	    //Vertically center the modal
	    $j(modalDialog).css('margin-top',($j(window).height()-$j(modalDialog).height())/2+'px');
	    return this;
	});