<script>
function print_r( array, return_val ) {    // Prints human-readable information about a variable

    var output = "", pad_char = " ", pad_val = 4;
 
    var formatArray = function (obj, cur_depth, pad_val, pad_char) {
        if(cur_depth > 0)
            cur_depth++;
 
        var base_pad = repeat_char(pad_val*cur_depth, pad_char);
        var thick_pad = repeat_char(pad_val*(cur_depth+1), pad_char);
        var str = "";
 
        if(obj instanceof Array || obj instanceof Object) {
            str += "Array\n" + base_pad + "(\n";
            for(var key in obj) {
                if(obj[key] instanceof Array || obj[key] instanceof Object) {
                    str += thick_pad + "["+key+"] => "+formatArray(obj[key], cur_depth+1, pad_val, pad_char);
                } else {
                    str += thick_pad + "["+key+"] => " + obj[key] + "\n";
                }
            }
            str += base_pad + ")\n";
        } else {
            str = obj.toString();
        };
 
        return str;
    };
 
    var repeat_char = function (len, char) {
        var str = "";
        for(var i=0; i < len; i++) { str += char; };
        return str;
    };
 
    output = formatArray(array, 0, pad_val, pad_char);
 
    if(return_val !== true) {
        document.write("<pre>" + output + "</pre>");
        return true;
    } else {
        return output;
    }
}

print_r(
    {
        name: "Anton",
        age : 18,
        interests: {
            games: ['Counter Strike', 'Космические рейнджеры'],
            internet: ['programming', 'news']
        },
        sex : "male"
    },
    false
);

</script>