var imgs = Array();
var imgn = Array();

imgn['b1'] = Array();
imgn['b1'][0] = "images/b-about-normal.gif";
imgn['b1'][1] = "images/b-about-up.gif"
imgn['b1'][2] = "images/b-about-down.gif";

imgn['b2'] = Array();
imgn['b2'][0] = "images/b-service-normal.gif";
imgn['b2'][1] = "images/b-service-up.gif"
imgn['b2'][2] = "images/b-service-down.gif";

imgn['b3'] = Array();
imgn['b3'][0] = "images/b-products-normal.gif";
imgn['b3'][1] = "images/b-products-up.gif"
imgn['b3'][2] = "images/b-products-down.gif";

imgn['b4'] = Array();
imgn['b4'][0] = "images/b-download-normal.gif";
imgn['b4'][1] = "images/b-download-up.gif"
imgn['b4'][2] = "images/b-download-down.gif";

imgn['b5'] = Array();
imgn['b5'][0] = "images/b-news-normal.gif";
imgn['b5'][1] = "images/b-news-up.gif"
imgn['b5'][2] = "images/b-news-down.gif";

imgn['b6'] = Array();
imgn['b6'][0] = "images/b-career-normal.gif";
imgn['b6'][1] = "images/b-career-up.gif"
imgn['b6'][2] = "images/b-career-down.gif";

imgn['b7'] = Array();
imgn['b7'][0] = "images/b-contact-normal.gif";
imgn['b7'][1] = "images/b-contact-up.gif"
imgn['b7'][2] = "images/b-contact-down.gif";

for(k in imgn) {
    imgs[k] = new Array();
    for(i = 0; i < 3; i++) {
	imgs[k][i] = new Image();
    imgs[k][i].src = imgn[k][i];
    }
}

function chImg(b, i)
{
    document.images[b].src = imgs[b][i].src;
    return true;
}