jQuery(function(){

var comments = jQuery('.comment');
var page = jQuery('.paginationPageNumber.activePage');
var start = 1;

if(page.length > 0)
{
    start = ((parseInt(page.html()) - 1) * 50) + 1;
}

if(comments.length > 0)
{
    comments.each(function(i, el){
        jQuery(this).prepend('<div class="comment-no">'+parseInt(start+i)+'</div>');
    });
}

});