One of the coolest things in the PHP programming language is its excellent handling of arrays. The same, sadly, cannot be said for JavaScript 
This small JavaScript function implements one of the cool functions available in PHP, making it easier to store things in an array, and then check to see if they’re in there later.
// Returns true or false based on whether the specified string is found
// in the array. This is based on the PHP function of the same name.
// Written by Beau Lebens
function in_array(stringToSearch, arrayToSearch) {
for (s = 0; s < arrayToSearch.length; s++) {
thisEntry = arrayToSearch[s].toString();
if (thisEntry == stringToSearch) {
return true;
}
}
return false;
}
