Array.prototype.myUnique = function(){
	var r = new Array();
	o:for(var i = 0; i < this.length; i++) {
		for(var x = 0; x < r.length; x++) {
			if(r[x]==this[i]) {
				continue o;	
			}
		}
		r[r.length] = this[i];
	}
	return r;
};

//usage

yourArray = yourArray.myUnique();

Use this to step through an Array and keep only values the first instance of any values, removing all subsequent duplicates.

Javascript remove duplicates from Array

JavaScript