if (document.images)
{
residentialon= new Image(35,149);
residentialon.src="http://www.2hsc.com/images/heaters_chillers/sidenav_residential_on.gif"; 
residentialoff= new Image(35,149);
residentialoff.src="http://www.2hsc.com/images/heaters_chillers/sidenav_residential_off.gif";

commercialon= new Image(35,149);
commercialon.src="http://www.2hsc.com/images/heaters_chillers/sidenav_commercial_on.gif"; 
commercialoff= new Image(35,149);
commercialoff.src="http://www.2hsc.com/images/heaters_chillers/sidenav_commercial_off.gif";

solarthermalon= new Image(35,149);
solarthermalon.src="http://www.2hsc.com/images/heaters_chillers/sidenav_solarthermal_on.gif"; 
solarthermaloff= new Image(35,149);
solarthermaloff.src="http://www.2hsc.com/images/heaters_chillers/sidenav_solarthermal_off.gif";

catalogon= new Image(35,149);
catalogon.src="http://www.2hsc.com/images/heaters_chillers/sidenav_catalog_on.gif"; 
catalogoff= new Image(35,149);
catalogoff.src="http://www.2hsc.com/images/heaters_chillers/sidenav_catalog_off.gif";		

slinecardon= new Image(35,149);
slinecardon.src="http://www.2hsc.com/images/heaters_chillers/sidenav_linecard_on.gif"; 
slinecardoff= new Image(35,149);
slinecardoff.src="http://www.2hsc.com/images/heaters_chillers/sidenav_linecard_off.gif";	
}

function yes(imgName)
{
if (document.images)
{
imgOn=eval(imgName + "on.src");
document[imgName].src= imgOn;
}
}

function no(imgName)
{
if (document.images)
{
imgOff=eval(imgName + "off.src");
document[imgName].src= imgOff;
}
}