<body>
<div id="mainDiv" class="mainDiv" style="text-align:center;">
Skala:
  <input type="text" id="tfProc" class="myTextInput" style="width:30px;">
<input type="button" id="btnWykonaj" value="Wykonaj"
       class="myButton" onclick="getImage();">
</div>
<div id="dataDiv" class="dataDiv" style="text-align:center;">
<img src='dane.php' alt='' id="img1">
</div>
</body>