Help modify a javascript code to perform a div scroll

Question

Hi,

The code below uses javascript to smoothly scroll content in a div. I don't need the smooth scrolling action, and only need the onclick action for the buttons. I would like to use this code so that if a scroll up/down button is pressed, the scroll would instantaneously jump up/down to a position, just like if you were to press the reset button (see demo link). If the down button is pressed, it would jump down the position of the content div (say 300px) and show the text instantaneously without showing how the scrolling text.

I am not familiar with JS, so it you know a shorter way, please suggest.

TIA

the demo link is HERE

The code is

/* 

    Easy Scroll v1.0
    written by Alen Grakalic, provided by Css Globe (cssglobe.com)
    please visit http://cssglobe.com/post/1495/easy-scroll-accessible-content-scroller

*/

this.easyscroll = function(){

    // id of the container element 
    var id = "myContent";

    // navigation buttons text
    var nav = ["Scroll Up", "Scroll Down", "Reset"];

    //  id for each navigation button (OPTIONAL)
    var navId = ["btnUp", "btnDown", "btnReset"];

    // movement speed
    var speed = 5;

    // desired height of the container element (in pixels)
    var height = 200;

    //
    // END CONFIG
    // do not edit below this line (unless you want to of course :) )
    //

    var obj = document.getElementById(id);

    obj.up = false;
    obj.down = false;
    obj.fast = false;

    var container = document.createElement("div");
    var parent = obj.parentNode;
    container.id="easyscroll";
    parent.insertBefore(container,obj);
    parent.removeChild(obj);    

    container.style.position = "relative";
    container.style.height = height + "px";
    container.style.overflow = "hidden";
    obj.style.position = "absolute";
    obj.style.top = "0";
    obj.style.left = "0";
    container.appendChild(obj);

    var btns = new Array();
    var ul = document.createElement("ul");
    ul.id="easyscrollnav";
    for (var i=0;i<nav.length;i++){
        var li = document.createElement("li");
        li.innerHTML = nav[i];
        li.id = navId[i];
        btns.push(li);
        ul.appendChild(li);
    };
    parent.insertBefore(ul,container);

    btns[0].onmouseover = function(){
        obj.up = true;
        this.className = "over";
    };
    btns[0].onmouseout = function(){
        obj.up = false;
        this.className = "";
    };      
    btns[1].onmouseover = function(){
        obj.down = true;
        this.className = "over";        
    };
    btns[1].onmouseout = function(){
        obj.down = false;
        this.className = "";
    };      
    btns[0].onmousedown = btns[1].onmousedown = function(){
        obj.fast = true;
    };  
    btns[0].onmouseup = btns[1].onmouseup = function(){
        obj.fast = false;
    };      
    btns[2].onmouseover = function(){       
        this.className = "over";
    };  
    btns[2].onmouseout = function(){        
        this.className = "";
    };      
    btns[2].onclick = function(){       
        obj.style.top = "0px";
    };      

    this.start = function(){                
        var newTop;
        var objHeight = obj.offsetHeight;
        var top = obj.offsetTop;
        var fast = (obj.fast) ? 2 : 1;
        if(obj.down){        
            newTop = ((objHeight+top) > height) ? top-(speed*fast) : top;   
            obj.style.top = newTop + "px";
        };  
        if(obj.up){      
            newTop = (top < 0) ? top+(speed*fast) : top;
            obj.style.top = newTop + "px";
        };
    };  
    obj.interval = setInterval("start()",50);       

};


//
// script initiates on page load. 
//

this.addEvent = function(obj,type,fn){
    if(obj.attachEvent){
        obj['e'+type+fn] = fn;
        obj[type+fn] = function(){obj['e'+type+fn](window.event );}
        obj.attachEvent('on'+type, obj[type+fn]);
    } else {
        obj.addEventListener(type,fn,false);
    };
};
addEvent(window,"load",easyscroll);