Function that take string and position of character to capitalize

I need a function that takes a string and position(s) of a character(s) and makes the whole thing lower case but then upperCases the position(s) passed.
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var txt = new String("Mystring");

function myFunction(theString,Position)


var newString= new Array();

for (var i=0;i<theString.length;i++)

var finalString;

for (var i=0;i<newString.length;i++)

return finalString;

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894359Author Commented:
Hi  unknown_routine, I need to be able to specify more than 1 character.

I think this should work.

function convert(myString, positions) {
	// positions should be a array of indexes
	// example: convert("some string", [2, 3])

	myString = myString.toLowerCase();

	for (var i = 0; i < positions.length; i++) {
		myString = myString.substring(0, positions[i - 1]) + myString.substr(positions[i], 1).toUpperCase() + myString.substring(positions[i + 1]);

	return myString;

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