javascript - ajax positioning -

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i have ajax code displayed in div @ top , left side of div, how can position ajax animation in middle , center of div?

<script language="javascript">         function visiontype_kamp(type,_link_)             {             var url_str = "index.cfm?fuseaction=objects2.emptypopup_get_vision_tabbed&is_property_vision="+type+"&&vision_position=1&mode=1&dongu=9&is_sale=0&vision_image_display=1&is_vision_prices=1&is_vision_product_name=1&is_vision_product_detail=1&is_vision_product_detail2=0&vision_image_width=50&vision_image_height=45&this_row_id_=kamp"             ajaxpageload(url_str,'vision_icerik_kamp' ,0,'',_link_);             }       </script>

and div:

<div id="vision_icerik_kamp"></div>

it simple if div has predefined dimensions, assume not means has no dimensions there si no way of finding such thing middle, you've got center block spanning as can, has no height, have first of set height on via javascript, place animating gif background image , set background position via javascript being center height/2px, way should work.

document.getelementbyid("vision_icerik_kamp").style.height = '100px'; document.getelementbyid("vision_icerik_kamp").style.backgroundimage = "./image/url.gif"; document.getelementbyid("vision_icerik_kamp").style.backgroundposition = "center 20px";

i not know if x coordinate first or y coordinat anyway idea, think div should not absolutely empty, should place &nbsp; inside it


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