[jQuery] How to create multiple dialog in same page by jquery?

When I try to to this, I found it looks like the second dialog wasn't
created.
Who knows how to implement it?
Thanks
$(document).ready
(
function()
{
$("div#form1").dialog
(
{
width: 290,
height: 380
}
);
$("div#form2").dialog
(
{
width: 290,
height: 200
}
);
}
)