dw_writeStyleSheet = function(file, screen) {


}

// slower, may flash unstyled ?
function dw_addLinkCSS(file, screen) {


}
/////////////////////////////////////////////////////////////////////

// Example class names: load_wn_lyr1, load_wn_lyr2_t2
dw_scrollObj.prototype.setUpLoadLinks = function(controlsId) {


}

dw_scrollObj.prototype.setUpScrollControls = function(controlsId, autoHide, axis) {
    var wndoId = this.id; var el = document.getElementById(controlsId); 
    if ( autoHide && axis == 'v' || axis == 'h' ) {
        dw_scrollObj.handleControlVis(controlsId, wndoId, axis);
        dw_Scrollbar_Co.addEvent( this, 'on_load', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
        dw_Scrollbar_Co.addEvent( this, 'on_update', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
    }
    
    var links = el.getElementsByTagName('a'), cls, eType;
    for (var i=0; links[i]; i++) { 
        cls = dw_scrollObj.get_DelimitedClass( links[i].className );
        eType = dw_scrollObj.getEv_FnType( cls.slice(0, cls.indexOf('_') ) );
        switch ( eType ) {
            case 'mouseover' :
            case 'mousedown' :
                dw_scrollObj.handleMouseOverDownLinks(links[i], wndoId, cls);
                break;
            case 'scrollToId': 
                dw_scrollObj.handleScrollToId(links[i], wndoId, cls);
                break;
            case 'scrollTo' :
            case 'scrollBy':
            case 'click': 
                dw_scrollObj.handleClick(links[i], wndoId, cls) ;
                break;
        }
    }
}

dw_scrollObj.handleMouseOverDownLinks = function (linkEl, wndoId, cls) {
    var parts = cls.split('_'); var eType = parts[0];
    var re = /^(mouseover|mousedown)_(up|down|left|right)(_[\d]+)?$/;
                
    if ( re.test(cls) ) { 
        var eAlt = (eType == 'mouseover')? 'mouseout': 'mouseup';
        var dir = parts[1];  var speed = parts[2] || null; 
        var deg = (dir == 'up')? 90: (dir == 'down')? 270: (dir == 'left')? 180: 0;
        
        dw_Event.add(linkEl, eType, function (e) { dw_scrollObj.col[wndoId].initScrollVals(deg, speed); } );
        dw_Event.add(linkEl, eAlt, function (e) { dw_scrollObj.col[wndoId].ceaseScroll(); } );
            
        if ( eType == 'mouseover') {
            dw_Event.add( linkEl, 'mousedown', function (e) { dw_scrollObj.col[wndoId].speed *= 3; } );
            dw_Event.add( linkEl, 'mouseup', function (e) { 
                dw_scrollObj.col[wndoId].speed = dw_scrollObj.prototype.speed; } ); 
        }
        dw_Event.add( linkEl, 'click', function(e) { if (e && e.preventDefault) e.preventDefault(); return false; } );
    }
}

// scrollToId_smile, scrollToId_smile_100, scrollToId_smile_lyr1_100    
dw_scrollObj.handleScrollToId = function (linkEl, wndoId, cls) {


}

// doesn't checks if lyrId in wndo, el in lyrId
dw_scrollObj.scrollToId = function(wndoId, id, lyrId, dur) {


}

dw_scrollObj.handleClick = function (linkEl, wndoId, cls) {


}

// get info from className (e.g., click_down_by_100)
dw_scrollObj.getClickParts = function(cls) {


}

dw_scrollObj.getEv_FnType = function(str) {
    var re = /^(mouseover|mousedown|scrollBy|scrollTo|scrollToId|click)$/;
    if (re.test(str) ) {
        return str;
    }
    return '';
}

// return class name with underscores in it 
dw_scrollObj.get_DelimitedClass = function(cls) {
    if ( cls.indexOf('_') == -1 ) {
        return '';
    }
    var whitespace = /\s+/;
    if ( !whitespace.test(cls) ) {
        return cls;
    } else {
        var classes = cls.split(whitespace); 
        for(var i = 0; classes[i]; i++) { 
            if ( classes[i].indexOf('_') != -1 ) {
                return classes[i];
            }
        }
    }
}

dw_scrollObj.handleControlVis = function(controlsId, wndoId, axis) {


}