Count Vowels and Consonants in jQuery

I wrote this program to count the number of vowels and consonants in a given string using jQuery.
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Program Listing

<title>Count Vowels and Consonants in jQuery</title>
<script type="text/javascript" src="jquery-3.2.1.min.js">
<script type="text/javascript">

function vowel_count(str)
	var vowel_list = 'aeiou';
	var vowel_count = 0;

	str_lower = str.toLowerCase();

	for (var x=0; x<str_lower.length; x++)
		if (vowel_list.indexOf(str_lower[x]) !== -1)
	return vowel_count;

function consonant_count(str)
	var consonant_list = 'bcdfghjklmnpqrstvwxyz';
	var consonant_count = 0;

	str_lower = str.toLowerCase();

	for (var x=0; x<str_lower.length; x++)
		if (consonant_list.indexOf(str_lower[x]) !== -1)
	return consonant_count;

$(document).ready(function() { 
var str = "Northern Negros State College of Science and Technology";	
var result;
document.write("<h2>Count Vowels and Consonants in jQuery</h2>");
document.write("<h2>Given Text    : " ,str,"</h2>");
display_vowels = vowel_count(str);
display_consonants = consonant_count(str);
document.write("<h2> Number of Vowels     : " ,display_vowels,"</h2>");
document.write("<h2> Number of Consonants : " ,display_consonants,"</h2>");

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