[manfeed]

Why do you use a variable instead of just this?
 

MyVideoNav.xml

xml:
[...]

          <control type="image">

            <left>120</left>

            <top>0</top>

            <width>400</width>

            <height>155</height>

<visible>!String.IsEmpty(ListItem.Art(clearart))</visible>

            <texture>$INFO[ListItem.Art(clearart)]</texture>

            <aspectratio aligny="center">scale</aspectratio>

          </control>   

[...]