imghome175on = new Image();
imghome175on.src = "images/home_on.gif";
imghome175off = new Image();
imghome175off.src = "images/175home_off.gif";

imgcatalogs175on = new Image();
imgcatalogs175on.src = "images/catalogs_on.gif";
imgcatalogs175off = new Image();
imgcatalogs175off.src = "images/175catalogs_off.gif";

imglinks175on = new Image();
imglinks175on.src = "images/links_on.gif";
imglinks175off = new Image();
imglinks175off.src = "images/175links_off.gif";

imgfree175on = new Image();
imgfree175on.src = "images/free_on.gif";
imgfree175off = new Image();
imgfree175off.src = "images/175free_off.gif";

imgabout175on = new Image();
imgabout175on.src = "images/about_on.gif";
imgabout175off = new Image();
imgabout175off.src = "images/175about_off.gif";

imgcontact175on = new Image();
imgcontact175on.src = "images/contact_on.gif";
imgcontact175off = new Image();
imgcontact175off.src = "images/175contact_off.gif";

// links image functions
function imgAct(imgName) {
    document[imgName].src = eval(imgName + "on.src");
}

function imgInact(imgName) {
    document[imgName].src = eval(imgName + "off.src");
}