javascript - image placing does not work at first load -


at first laod, image , escape button not appear in designated place. go on , close divs clicking escape button , execute function again. surprisingly, @ second execution, works perfectly. know why results different @ first load?

(firefox) 

  < html>     < head>         < style type="text/css">             #wievbackground {                  position: fixed;                 top: 0;                 left: 0;                 height:100%;                 width:100%;                 background-color:red;             }             #escapebutton {                 position:fixed;                 background-color:white;                 height:40px;                 width:40px;             }         < /style>     < /head>          <body>              <div id="wievwrap"> </div>              <script type="text/javascript">                 function itemview(itemurl) {                     document.getelementbyid("wievwrap").innerhtml = ' <div id="wievbackground"> </div> ';                     document.getelementbyid("wievbackground").innerhtml = ' <img id="theitem" style="position:fixed" src="' + itemurl + '"> ';                     document.getelementbyid("wievbackground").innerhtml += '<div onclick="document.getelementbyid(\'wievwrap\').innerhtml=\'\';"  id="escapebutton"></div>';                      document.getelementbyid("theitem").style.left = document.getelementbyid("theitem").parentelement.offsetwidth / 2 - document.getelementbyid("theitem").offsetwidth / 2 + "px";                     document.getelementbyid("theitem").style.top = document.getelementbyid("theitem").parentelement.offsetheight / 2 - document.getelementbyid("theitem").offsetheight / 2 + "px";                      var x = parseint(document.getelementbyid("theitem").style.left) + parseint(document.getelementbyid("theitem").offsetwidth - document.getelementbyid("escapebutton").offsetwidth / 2);                      document.getelementbyid("escapebutton").style.left = x + "px";                     document.getelementbyid("escapebutton").style.top = parseint(document.getelementbyid("theitem").style.top) - document.getelementbyid("escapebutton").offsetheight / 2 + "px";                  }             </script>             <div></div>             <div onclick="itemview('smt.png')">function</div>         </body>     </html>


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