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<form action="url/servo.php?servo=0&position=<? echo $position; ?>" method="post">
<input type="range" min="0" max="180" value="0" step="1" onchange="showValue(this.value)" / style="width:75%; margin:100px auto;">
  <input type="submit" name="button" />
</form> 


<span id="range">0</span>
<script type="text/javascript">
function showValue(newValue)
{
	document.getElementById("range").innerHTML=newValue;
}
</script>