HI! I'm making a program that lets you type in a word and converts it to pig latin. I wrote it out in Python originally, and the program doesn't work. Is there something wrong with my for loop??

Code:
<HTML>

<HEAD>

<SCRIPT LANGUAGE = "JavaScript">

var original = prompt('Type a word');

var count = 0

var istrue = False

var  suffix = ""

var modified = ""

var letter;

for (letter in original)

{

	if (!(istrue)){

		if(letter (!(in "aeiouy")){

			suffix = suffix + letter;

			}

		if(letter in "aeiouy"){

			istrue = True;

			}

	}

	if(istrue){

		modified = modified + letter;

		}

}

alert(modified + suffix + "ae");

</SCRIPT>

</HEAD>

<BODY>

</BODY>

</HTML>