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<h1>Body Mass Index Calculator</h1>
<p>Enter your height:
	<input type="text" id="height" />
	<select type="multiple" id="heightunits">
		<option value="metres" selected="selected">metres</option>
		<option value="inches">inches</option>
	</select>
</p>
<p>Enter your weight:
	<input type="text" id="weight" />
	<select type="multiple" id="weightunits">
		<option value="kg" selected="selected">kilograms</option>
		<option value="lb">pounds</option>
	</select>
</p>
<input type="button" value="computeBMI" onclick="computeBMI()"/>
<h1>Your BMI is: <span id="output">?</span></h1>

<h2>This means you are: value = <span id='comment'></span> </h2>