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Find sub string position JavaScript

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Demo
Water is a chemical substance with the chemical formula H2O



Code
<script type="text/javascript" src="jquery.js"></script>
<script>
$(document).ready(function(){
$("#butt").click(function(){
var position=($("#str").text().toLowerCase()).indexOf($("#txtBox").val());
if(position>0)
 alert(position);
else
 alert("Not Found");
});
});
</script>
<span id="str">
Water is a chemical substance with the chemical formula H2O
</span>
<br/>
<input type="text" id="txtBox"/>
<button id="butt">Find Position</button>
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