var mousey, currentpos, timer; 
      function currentmousey() {
       mousey = window.event.y;


      }
      function initialize(){ 
      timer = setTimeout("scrollwindow()",mousey/2);
	//document.body.style.cursor="hand";

      }
      function stopscroll(){
       clearInterval(timer);
	//document.body.style.cursor="";
      }
      function scrollwindow(){
      currentpos = document.body.scrollTop;
      window.scroll(0,++currentpos); 
      if (currentpos != document.body.scrollTop){
      stopscroll();
      }else{
      initialize();
      }
      }
      document.ondblclick = initialize;
      document.onmousedown = stopscroll;
      document.onmousemove = currentmousey;