Help with next prev buttons

1

i have a movie clip thats populated with paragraphs of text i was hoping to get a little help with the conditional logic that would apply, i had it working but with errors so i took it apart and started from scratch
basically i wanted the next and previous buttons to tween the movie clip the length of 2 paragraphs at a time, stopping at the front and the back heres what i got


if (ztotal>2) {
        if(currentpage <=ztotal &&total !=0 ){
        var sectin = b_sections.attachMovie("secbut", "secbut", 555);
        sectin._x = 1019;
        sectin._y = 49;
        sectin._alpha = 0;
        sectin.tween("_alpha", 100, 1, "linear", 0);
        sectin.onRollOver = onDragOver=function () {
            this.colorTo(0xFF7300, 1);
        };
        sectin.onRollOut = onDragOut=function () {
            this.colorTo(null, 1);
        };
        sectin.onRelease = function() {
            
            prevpage = Number(b_sections.pgno.pageno.text)-1;
            newpage = Number(b_sections.pgno.pageno.text)+1
            trace(sectin._x)
            b_sections.pgno.pageno.text = Number(newpage);
            this.tween("_y", 22, 1, "easeOutBounce", 0);
            b_sections.s_holder.tween("_x",  b_sections.s_holder._x-835, 1, "easeOutExpo", 0);
            var sectin2 = b_sections.attachMovie("secbut2", "secbut2", 556);
            
            sectin2._x = 1019
            sectin2._y = 72;
            sectin2._alpha = 0;
            sectin2.tween("_alpha", 100, 1, "linear", .5);
            sectin2.onRelease = function() {
                b_sections.pgno.pageno.text = prevpage;
                this.tween("_alpha", 0, 1, "linear", 0);
                sectin.tween("_y", 49, 1, "easeOutBounce", 0);
                b_sections.s_holder.tween("_x", b_sections.s_holder._x+835, 1, "easeOutExpo", 0, function () {
                    sectin2.removeMovieClip();
                });
            };
            }
        };
    }