ArcGIS Dynamic & Cached services together

HTML

<link rel="stylesheet" href="http://openlayers.org/dev/theme/default/style.css">
<script src="http://openlayers.org/dev/OpenLayers.js"></script>
<div id="map" class="smallmap"></div>

CSS

#map{
    width:450px;
    height:400px;
}

/* avoid pink tiles */
.olImageLoadError {
    background-color: transparent !important;
}

JavaScript

var map;
var layer;
var geographic = new OpenLayers.Projection("EPSG:4326");
var mercator = new OpenLayers.Projection("EPSG:3857");
		
var layerInfo = {
                  "currentVersion" : 10.01, 
                  "serviceDescription" : "This worldwide street map presents highway-level data for the world and street-level data for the United States, Canada, Japan, Southern Africa, and a number of countries in Europe and elsewhere. This comprehensive street map includes highways, major roads, minor roads, railways, water features, administrative boundaries, cities, parks, and landmarks, overlaid on shaded relief imagery for added context. The street map was developed by ESRI using ESRI basemap data, AND road data, USGS elevation data, and UNEP-WCMC parks and protected areas for the world, and Tele Atlas Dynamap? and Multinet? street data for North America and Europe. Coverage for street-level data in Europe includes Andorra, Austria, Belgium, Czech Republic, Denmark, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Luxembourg, Netherlands, Northern Ireland (Belfast only), Norway, Poland, Portugal, San Marino, Slovakia, Spain, Sweden, and Switzerland. Coverage for street-level data elsewhere in the world includes China (Hong Kong only), Colombia, Egypt (Cairo only), Indonesia (Jakarta only), Japan, Mexico (Mexico City only), Russia (Moscow and St. Petersburg only), South Africa, Thailand, and Turkey (Istanbul and Ankara only). For more information on this map, visit us \u003ca href=\"http://goto.arcgisonline.com/maps/World_Street_Map \" target=\"_new\"\u003eonline\u003c/a\u003e.", 
                  "mapName" : "Layers", 
                  "description" : "This worldwide street map presents highway-level data for the world and street-level data for the United States, Canada, Japan, Southern Africa, most countries in Europe, and several other countries. This comprehensive street map includes highways, major roads, minor roads, one-way arrow...