var buttona=new Array(2);
var buttonb=new Array(2);

for (var i=0; i<2; i++)
{
buttona[i]=new Image(); buttona[i].src="../graphics/b" + i + "a.gif";
buttonb[i]=new Image(); buttonb[i].src="../graphics/b" + i + "b.gif";
}

function hin(i)
{
document.images[i].src=buttonb[i].src;
}

function weg(i)
{
document.images[i].src=buttona[i].src;
}