@Unique in Javascript

Update, 16.06.09: As Ronaldo points out, this doesn't work in IE6, as it doesn't have the Array.indexOf-method (I probably tested the function in a Prototype JS-enviroment). To make the function work for browsers that doesn't have the aforementioned method:

if(!Array.indexOf){
    Array.prototype.indexOf = function(obj){
        for( var i = 0, len = this.length; i < len; i++){
            if(this[i]==obj){
                return i;
            }
        }
        return -1;
    }
}

function arrayUnique( array ){
    var uniqueArray = [];
     
    var item;
    for( var i = 0, len=array.length ; i < len ; i++ ){
        item = array[i];
        if( uniqueArray.indexOf( item ) == -1 ){
            uniqueArray.push( item );
        }
    }

    return uniqueArray;
}

Tested in IE6/FF2