if (document.images) {
var swap21b = new Image();
    swap21b.src = "swap/swap21b.gif";
var swap21a = new Image();
swap21a.src = "swap/swap21a.gif";
var swap22b = new Image();
    swap22b.src = "swap/swap22b.gif";
var swap22a = new Image();
swap22a.src = "swap/swap22a.gif";
var swap23b = new Image();
    swap23b.src = "swap/swap23b.gif";
var swap23a = new Image();
swap23a.src = "swap/swap23a.gif";

}

function noswap(image)
{
if (image==21) {    document.swap21.src = "swap/swap21a.gif";    }
if (image==22) {    document.swap22.src = "swap/swap22a.gif";    }
if (image==23) {    document.swap23.src = "swap/swap23a.gif";    }
}
function swap(image)
{
    if (image==21) {    document.swap21.src = "swap/swap21b.gif";    }
if (image==22) {    document.swap22.src = "swap/swap22b.gif";    }
if (image==23) {    document.swap23.src = "swap/swap23b.gif";    }
}