if (document.images) {  // make sure the browser supports rollovers
    	img1_off   = new Image(); img1_off.src   = "/images/fr/bt_home_off.gif";
    	img1_over  = new Image(); img1_over.src  = "/images/fr/bt_home_over.gif";

    	img2_off   = new Image(); img2_off.src   = "/images/fr/bt_historic_off.gif";
    	img2_over  = new Image(); img2_over.src  = "/images/fr/bt_historic_over.gif";

    	img3_off   = new Image(); img3_off.src   = "/images/fr/bt_program_off.gif";
    	img3_over  = new Image(); img3_over.src  = "/images/fr/bt_program_over.gif";

    	img4_off   = new Image(); img4_off.src   = "/images/fr/bt_news_off.gif";
    	img4_over  = new Image(); img4_over.src  = "/images/fr/bt_news_over.gif";

    	img5_off   = new Image(); img5_off.src   = "/images/fr/bt_partners_off.gif";
    	img5_over  = new Image(); img5_over.src  = "/images/fr/bt_partners_over.gif";

    	img6_off   = new Image(); img6_off.src   = "/images/fr/bt_contact_off.gif";
    	img6_over  = new Image(); img6_over.src  = "/images/fr/bt_contact_over.gif";
}

function changeImg(imgName,imgSrc) {
	if (document.images) {
		document[imgName].src = eval(imgSrc + ".src");
    }
}

/* call  the function that way
onMouseOver="changeImg('img1','img1_over');" onMouseOut="changeImg('img1','img1_off');
*/