make active url's from javascript

urlize.js

jQuery('#last_tweet').urlize();

jQuery.fn.urlize = function() {
    if (this.length > 0) {
        this.each(function(i, obj){
            // making links active
            var x = jQuery(obj).html();
            var list = x.match( /\b(http:\/\/|www\.|http:\/\/www\.|https:\/\/www\.|https:\/\/)[^ <]{2,200}\b/g );
            if (list) {
                for ( i = 0; i < list.length; i++ ) {
                    var prot = list[i].indexOf('http://') === 0 || list[i].indexOf('https://') === 0 ? '' : 'http://';
                    x = x.replace( list[i], "<a target='_blank' href='" + prot + list[i] + "'>"+ list[i] + "</a>" );
                }

            }
            jQuery(obj).html(x);
        });
    }
};