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Hello, I've tried to create a very simple input form to search for a specific word in a string. That said, I'm not having much luck. Firebug is alerting me of an exception error, and I can't figure out why. The code is below. The error msg says it's not a function. function calculate() { 'use strict'; var output; var sentence = document.getElementById('sentence'); var keyword = document.getElementById('keyword'); if(sentence && (sentence.value.length > 0)){ if(sentence.search(keyword) != -1){ //error msg here output = keyword + " is in the sentence"; }else{ output = "sorry, no word exists"; } document.getElementById('output').value = output; } return false; } function init(){ 'use strict'; document.getElementById('stringTest').onsubmit = calculate; } window.onload = init; I'm basing this on a smaller example I got to work, but it didn't involve form input. The following is that example. var str = "this is a big dog"; var regExp = "cat"; if(str.search(regExp) != -1){ document.write(regExp + " was found"); }else{ document.write(regExp + " was not found"); } Comments appreciated. K