<input type="range" min="0" max="255">
<input type="text" id="show">

<input type="range" min="0" max="255" style="height:100px;width:400px;background:yellow;" onchange="change()" id="range">
<input type="text" id="show">

<script type="text/javascript">
function change(){
var num=document.getElementById("range");
var location=document.getElementById("show");
location.value=num.value;
}
</script>