if (document.images) {
    growersup       = new Image();
    growersup.src   = "images/mainnav_growers.gif";
    growersdown     = new Image() ;
    growersdown.src = "images/hover_mainnav_growers.gif" ;
	roastersup       = new Image();
    roastersup.src   = "images/mainnav_roasters.gif";
    roastersdown     = new Image() ;
    roastersdown.src = "images/hover_mainnav_roasters.gif" ;
	retailersup       = new Image();
    retailersup.src   = "images/mainnav_retailers.gif";
    retailersdown     = new Image() ;
    retailersdown.src = "images/hover_mainnav_retailers.gif" ;
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}