How to traduice in Bing maps ajax 6.3

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ASP.NET

Javascript

I have this code with bin maps ajax 7.0 and i haven't credential key for this i will traduice in bing maps ajax 6.3 , if someone have an idea help me

        this.setBounds = function () {
var bounds =  Microsoft.Maps.LocationRect.fromLocations(map.getLocations());
var zoomPrev = this.map.getZoom();
var cnt = 0;

for (key in this.points) {
        if(this.points[key] != null)
        {
    cnt++;
    bounds.extend(this.points[key]);
        }
}
this.map.fitBounds(bounds);
if (cnt < 2) this.map.setZoom(zoomPrev);

    }