I dont know why when I use the function wheel () the scrollbar moves to a certain point and then jumps. can you send me any ideas and help.


function wheel()
{


 //calculate the altitude of the schuifbalk

 // bereken de hoogte van de schuifbalk

 rulerH = scrollH - (dragH); //change

 //number of page steps by dragStep variable
 // Aantal pagina stappen


 dragStep = scrollH /(contentH / rulerH); // change to - Synhronise the content height with the ruller height with the and *3 step size durring scroll


 nWaarde = nWaarde + event.wheelDelta;

 if( oldWaarde < nWaarde)
 {
     nWaarde = oldWaarde; //change to new nwaarde

        dragT = dragT - dragStep/10;

      contentT = contentT + dragStep;


    if (contentT > 0 )

    {
     contentT = 0;
     dragT = rulerT - 2;
    }
        moveTo();

 }