var htime;
var offset=30;
var id='topics'
function up(){
   htime=setInterval('scrllup()',offset);
}

function scrllup(){
      var div = document.getElementById(id); 
       div.scrollTop++; 
	  
}
function down(){
htime=setInterval('scrlldown()',offset); 
}
function scrlldown(){
    var div = document.getElementById(id); 
    div.scrollTop--; 
}
function Mstop(){
   if(htime!= '') clearTimeout(htime)

}
/**onmouseover="up()"  onmouseout="Mstop()"
-----------------------------------------------------------*/