Promblem with repeat words from array

function wordsLoaded(event:Event):void
{
	var wordString:String = wordLoader.data;
	var wordArray:Array = wordString.split('\r\n');
	
	lineNumber = pickRandomLine(wordArray);
	
	var oldString:String = wordArray[lineNumber];
	
	word = oldString;
	wordScore = word.length;
	
	var newString:String = randomizeWord(oldString);

		while(oldString == newString)
		{
			newString = randomizeWord(oldString);
		}

	jumble_txt.text = String(newString);
}

function pickRandomLine(lenght:Array):Number
{
	var linePick:Number = Math.round((lenght.length -1) * Math.random());
	
	return linePick;
}

function pickRandomLine(lenght:Array):Number
{
	var linePick:Number = Math.round((lenght.length -1) * Math.random());
	
	//Save lineNumber for exclusion from word list
	exclusionArray[exclusionArray.length] = linePick;
	
	return linePick;
}