if (document.images) {
 colorOff = new Image();
 colorOff.src = "../images/press1.jpg";
 colorOn = new Image();
 colorOn.src = "../images/press2.jpg";
 }
function colorIt()  {
        if (document.images) {
                document.images["press"].src = colorOn.src;
                }
}

function uncolorIt()  {
        if (document.images) {
                document.images["press"].src = colorOff.src;
                }

}