i00 = new Image(); i00.src = "/images/nav/sdaa_1_off.gif";
i01 = new Image(); i01.src = "/images/nav/sdaa_2_off.gif";
i02 = new Image(); i02.src = "/images/nav/sdaa_3_off.gif";
i03 = new Image(); i03.src = "/images/nav/sdaa_4_off.gif";

i10 = new Image(); i10.src = "/images/nav/sdaa_1_on.gif";
i11 = new Image(); i11.src = "/images/nav/sdaa_2_on.gif";
i12 = new Image(); i12.src = "/images/nav/sdaa_3_on.gif";
i13 = new Image(); i13.src = "/images/nav/sdaa_4_on.gif";

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