[jQuery] White circle appears before message box loads...

Hi,

When loading the message box for the first time I get a white circle
appear before my white box appears.

I wonder if it is to do with the fact I am using rounded corners and
the circle may be a mask, anyone else experience this?

Code below:

function showdiv()
{
$.blockUI({
message: $('img#displayBox'),
css: {
border: 'none',
padding: '5px',
backgroundColor: '#fff',
'-webkit-border-radius': '10px',
'-moz-border-radius': '10px',
opacity: '0.9',
color: '#000',
width: '150'
}
});
}

Ta