How To Use Javascript To Insert Text At Cursor Position In A Form Input Element

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Was stuck in a rut here with a JavaScript problem, but I did some active research that I became very happy with:

  	function InsertTextAtCursor(input, valueString){
		//IE support
		if (document.selection) {
			$(input).focus();
			sel = document.selection.createRange();
			sel.text = valueString;
		}
		//MOZILLA/NETSCAPE support
		else if ($(input).selectionStart || $(input).selectionStart == '0') {
			var startPos = $(input).selectionStart;
			var endPos = $(input).selectionEnd;
			$(input).value = $(input).value.substring(0, startPos)
			+ valueString
			+ $(input).value.substring(endPos, $(input).value.length);
		} 
		else{
			$(input).value += valueString;
		}

	}

Notice that I've used prototype as well in this solution. The function could be a lot more, but I just need it for one feature only.