<FORM>
<INPUT ID="counter1" STYLE="position:relative; left:'0px'" TYPE="button" VALUE="Move Button" 
onclick="document.getElementById('counter1').style.left = '500px';">
</FORM>

That renders like this:

<FORM>
<INPUT ID="counter2" STYLE="position:relative; left:0" TYPE="button" VALUE="Move Button" 
onclick="document.getElementById('counter2').style.left = 500;">
</FORM>

And you can play with it as well:

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