var t = 0;

function up()
{
t +=432;

with(document.getElementById("contents"))
{
t +=1;

if (t > 0)
t = 0;

if(style)
style.left = t + "px";
else
setAttribute("style", "left: " + t + "px");
}
}

function down()
{
if (t > -1000)
t -= 432;

with(document.getElementById("contents"))
{

if(style)
style.left = t + "px";
else
setAttribute("style", "left: " + t + "px");
}
}