dw_scrollObj.loadLayer = function(wndoId, lyrId, horizId) {
    if ( dw_scrollObj.col[wndoId] ) dw_scrollObj.col[wndoId].load(lyrId, horizId);
}

dw_scrollObj.initScroll = function(wndoId, dir, speed) {
    var deg = dir == 'up'? 90: dir == 'down'? 270: dir == 'left'? 180: dir == 'right'? 0: dir;
    if ( deg != null && dw_scrollObj.col[wndoId] ) {
        dw_scrollObj.col[wndoId].initScrollVals(deg, speed);
    }
}

dw_scrollObj.stopScroll = function(wndoId) {
    if ( dw_scrollObj.col[wndoId] ) dw_scrollObj.col[wndoId].ceaseScroll();
}

dw_scrollObj.doubleSpeed = function(wndoId) {
    if ( dw_scrollObj.col[wndoId] ) dw_scrollObj.col[wndoId].speed *= 2;
}

dw_scrollObj.resetSpeed = function(wndoId) {
    if ( dw_scrollObj.col[wndoId] ) dw_scrollObj.col[wndoId].speed /= 2;
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = function() { func(); }
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}