Untitled

<!DOCTYPE html>
<html>
<head>
	<script type="text/javascript">

		var a,b;
		function setValues()
		{
			a = (document.getElementbyId("a").value);
			b = (document.getElementById("b").value);
	    }
	    function sum()
	    {
	    	setValues();
	    	result = a+b;
	    	alert("The sum is equals to"+result);
	    }
	    	    }
	    function result()
	    {
	    	setValues();
	    	result = a-b;
	    	alert("The rest is equals to"+result);
	    }

	    }
	    function multiply()
	    {
	    	setValues();
	    	result = a*b;
	    	alert("The operation is equals to"+result);
	    }

	    }
	    function div()
	    {
	    	setValues();
	    	result = a/b;
	    	alert("The operation is equals to"+result);
	    }


	<script>

</head>
<body>
	<div>
	<input id="a" type="text"/>
	<input id="b" type="text"/>
	<input type="button" onclick="sum()" value="sum/>"
	<input type="button" onclick="rest()" value="rest"/>
	<input type="button" onclick="mult()" value="multilpy"/>
	<input type="button" onclick="div()" value="divide"/>
	</div>
</body>
</html>