function - Jquery check whether element is hidden (continuously) -

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how check whether element made hide @ once. i.e how notify visibility of element.

in case, element made hide slideup function. @ once should notified visibility of element.

i got idea of using bind() method. not have onhide event. how ? suggestions helpful !

edit:

i know possible use is(':hidden') want check continuously addeventlistener 

if($('#selector').is(':visible')){    //is visible }else{   //is not visible threfore hidden }

edit if not exist have check opacity/filter property

so 

if($('#selector').css('opacity')!=0){        //is visible//or partially visible//depends on opacity     }else{       //is not visible threfore hidden     }

also make sure check opacity cross browser

edit 2

function checkvisibility(){    //put visibility checker here    settimeout('checkvisibility',1000)//every 1 second... }

note: repetitions might slow down browser


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