var booklinePos = 0;
var booklinePosIE = 0;
function moveBooklineRight(e){
  if(booklinePos <= (e-2)){
    booklinePos++;
    if(is.ie){
      booklinePosIE -= 178;
      booklinePosIETxt = booklinePosIE+"px";
      $('booklinelistdiv').setStyle({marginLeft: booklinePosIETxt});
    }
    else { new Effect.Move($('booklinelistdiv'), { x: -178,  transition: Effect.Transitions.sinoidal });}    

  }
  }
function moveBooklineLeft(){
  if(booklinePos > 0 ){
    booklinePos--;
    if(is.ie){
      booklinePosIE += 178;
      booklinePosIETxt = booklinePosIE+"px";
      $('booklinelistdiv').setStyle({marginLeft: booklinePosIETxt});
    }
    else { new Effect.Move($('booklinelistdiv'), { x: 178, transition: Effect.Transitions.sinoidal }); }
  }
  }