cursor_position.js

var cursor_position = {
    get: function(input) {
		if (input === null)
			return 0;

		var position = 0;

		if ('selectionStart' in input || input.selectionStart == 0) {
			position = input.selectionStart;
		}
		else if (document.selection) {
			input.focus();

			var selection = document.selection.createRange ();

			selection.moveStart ('character', -input.value.length);
			position = selection.text.length;
		}

		return position;
	},

	set: function(input, position) {
		if (input === null)
			return 0;

		if (input.createTextRange) {
			var range = input.createTextRange();
			range.move('character', position);
			range.select();

			return true;
		}
		else {
			if (input.selectionStart || input.selectionStart === 0 /* FF */) {
				input.focus();
				input.setSelectionRange(position, position);
				return true;
			}
			else {
				input.focus();
				return false;
			}
		}
	}
}

/*
var input = document.getElementById('input');
cursor_position.get(input)
cursor_position.set(input, 10);
*/