Never mind, I found the answer. This works great. Let me know if I missed
anything, and thanks in advance.

var VK_F5 = 0x74;

document.onkeydown = function()
{
if (event.keyCode == VK_F5)
{
event.keyCode = 0;
event.returnValue = false;
event.cancelBubble = true;
return false;
}
}