Something

<HTML>
 <HEAD>
 	<TITLE> M 150 TMAO3 Question 1 (i): Enter a number </TITLE>
	<SCRIPT language=JavaScript>
		var userInput;
		var userNumber;
 		var upperLimit;
                var userString;
                var charToFind;

		userString = window.prompt('Please enter a string of 8 characters or more', ' ');
		
		upperLimit = userString.length;
                
                while ( upperLimit < 8 ) {
                    userString = window.prompt('Please re-enter a string of 8 characters or more', ' ');
                    upperLimit = userString.length;
                }

 		userInput = window.prompt('Please enter a number in the range 1 to ' + upperLimit,' ');

 		userNumber = parseFloat(userInput);

 		while ((userNumber < 1) || (userNumber > upperLimit)) {

			userInput = window.prompt('Please re-enter - number should be in range 1 to ' + upperLimit,' ');
			userNumber = parseFloat(userInput);
		}

		charToFind = userString.charAt(userNumber - 1);
                userNumber=0;
		for( var x=0; x < upperLimit; x++) {
			if (userString.charAt(x) == charToFind) {
				userNumber = userNumber + 1;
			}
		}


 		document.write('<BR>' + 'Your output was ' + userNumber);
	</SCRIPT>
 </HEAD>
 <BODY>
 </BODY>
</HTML>