1.8rc1 dialog position

1.8rc1 dialog position

Hi guys,

i want to open my dialog on position ["center",20]. This works great as long as the viewport is bigger than the current dialog. But if not, than the dialogs position is left: center, but top:-130 (for example)

Here is my overlay-call

$("#overlay").dialog({position:["center",20], width:431, height:300, minHeight:false, minWidth:false, modal:true, draggable:false, resizable:false, dialogClass:"customOlay"});