Coderbyte challenge. 5 minute vowel counter.

vowelcounter.js

function VowelCount(str) {
    var temp = str.split("");

    var vowelcount = 0;

    function Compare(value) {
        var vowels = ["a", "e", "i", "o", "u"];
        for (i = 0; i <= vowels.length - 1; i++) {
            if (value == vowels[i]) vowelcount++;
        }
    }

    temp.forEach(Compare);

    // code goes here  
    return vowelcount;

}
document.write(VowelCount("aeiou"));