function navOn(carry)
{document[carry].src="images/nav/"+carry+"_on.gif";}

function navOff(carry)
{document[carry].src="images/nav/"+carry+"_off.gif";}

function subnavOn(carry)
{document[carry].src="images/subnav/"+carry+"_on.gif";}

function subnavOff(carry)
{document[carry].src="images/subnav/"+carry+"_off.gif";}