<img src="{{ index .Params "src" }}" 
    {{- if isset .Params "alt" }} alt="{{ index .Params "alt"}}" {{ end -}}
    class="small-img {{ if isset .Params "smartfloat" -}}
        {{- if eq .Params.smartfloat "left" -}}
            smartfloat-left
        {{- else if eq .Params.smartfloat "right" -}}
            smartfloat-right
        {{- end -}}
    {{- end }}"
    {{- if isset .Params "width" }} style="width: {{ index .Params "width" }};" {{- end -}}
/>