<body>
<div id="mainDiv" class="mainDiv">
Polecenie
<input type="text" value="" 
       id="tfCommand" class="myTextInput"/>
<input type="button" value="Wykonaj" class="myButton"
       onclick="startRequest();" id="btnWykonaj" />
</div>
<div id="dataDiv" class="dataDiv">
</div>
</body>