/*
if (document.images) {
    link1off       = new Image();
    link1off.src   = "images/1_off.gif" ;
    link1on     = new Image() ;
    link1on.src = "images/1_on.gif" ;
    
    link2off       = new Image();
    link2off.src   = "images/2_off.gif" ;
    link2on     = new Image() ;
    link2on.src = "images/2_on.gif" ;
    
    link3off       = new Image();
    link3off.src   = "images/3_off.gif" ;
    link3on     = new Image() ;
    link3on.src = "images/3_on.gif" ;
    
    link4off       = new Image();
    link4off.src   = "images/4_off.gif" ;
    link4on     = new Image() ;
    link4on.src = "images/4_on.gif" ;
    
    link5off       = new Image();
    link5off.src   = "images/5_off.gif" ;
    link5on     = new Image() ;
    link5on.src = "images/5_on.gif" ;
    
    link6off       = new Image();
    link6off.src   = "images/6_off.gif" ;
    link6on     = new Image() ;
    link6on.src = "images/6_on.gif";

    link1offpng = new Image();
    link1offpng.src = "images/1_off.png";
    link1onpng = new Image();
    link1onpng.src = "images/1_on.png";

    link2offpng = new Image();
    link2offpng.src = "images/2_off.png";
    link2onpng = new Image();
    link2onpng.src = "images/2_on.png";

    link3offpng = new Image();
    link3offpng.src = "images/3_off.png";
    link3onpng = new Image();
    link3onpng.src = "images/3_on.png";

    link4offpng = new Image();
    link4offpng.src = "images/4_off.png";
    link4onpng = new Image();
    link4onpng.src = "images/4_on.png";

    link5offpng = new Image();
    link5offpng.src = "images/5_off.png";
    link5onpng = new Image();
    link5onpng.src = "images/5_on.png";

    link6offpng = new Image();
    link6offpng.src = "images/6_off.png";
    link6onpng = new Image();
    link6onpng.src = "images/6_on.png";
}
function linkon( imagename )
{
   if (document.images) {
       document[ imagename ].src = eval( imagename + "on.src" );
    }
}
function linkoff( imagename )
{

    if (document.images) {
      document[ imagename ].src = eval( imagename + "off.src" );
    }
}

function linkonpng(imagename) {
    if (document.images) {
        document[imagename].src = eval(imagename + "onpng.src");
    }
}
function linkoffpng(imagename) {

    if (document.images) {
        document[imagename].src = eval(imagename + "offpng.src");
    }
}
*/