gistfile1.txt

<script type="text/javascript">
	
	function plus(operator,value){
		/* code here*/

		return result;
	}

	function divide(operator,value){
		/* code here*/

		return result;
	}

	function times(operator,value){
		/* code here*/

		return result;
	}

	function minus(operator,value){
		/* code here*/

		return result;
	}

	function checker(input){
		/* code here*/

		/* condition code 

		if(exploded input operator is equal to "-")
			holder = minus(operator,value);
		else if(exploded input operator is equal to "*")
			holder =  times(operator,value);
		....
		*/
		return value sa selector sa textbox nga naka focus;
	}
</script>