Two high-level functions, "array_search" and "array_unique" for good old Javascript.

array_fns.js

function arrayUnique(ar)
{
  if(ar.length && typeof ar!=='string')
	{
		var sorter = {};
		var out = [];
		for(var i=0,j=ar.length;i<j;i++)
		{
			if(!sorter[ar[i]+typeof ar[i]])
			{
				out.push(ar[i]);
				sorter[ar[i]+typeof ar[i]]=true;
			}
		}
	}
	return out || ar;
}
function arraySearch(arr,val) {
    for (var i=0; i<arr.length; i++)
    if (arr[i] == val)
    return i;
    return false;
}