// cache the buttons
img1 = new Image(); 
img1.src = "/cover/titlesLo.png";
img2 = new Image(); 
img2.src = "/cover/normalLo.png";
img3 = new Image(); 
img3.src = "/cover/normalHi.png";
img4 = new Image(); 
img4.src = "/cover/framesLo.png";
img5 = new Image(); 
img5.src = "/cover/framesHi.png";
img6 = new Image(); 
img6.src = "/cover/iphoneLo.png";
img7 = new Image(); 
img7.src = "/cover/iphoneHi.png";
img8 = new Image(); 
img8.src = "/cover/tinyLo.png";
img9 = new Image(); 
img9.src = "/cover/tinyHi.png";

// simple rollover
function roll()
{
    document[roll.arguments[0]].src = roll.arguments[1];
}