Array.prototype.pushUniqueVal = function(value) {
        for (var i in this) {
                if (this[i] == value) {
                        return {success:false,pos:i};
                }
        }
        var pos=this.length;
        this[pos] = value;
        return {success:true, pos:pos};
};
Array.prototype.mergeUnique=function(new_arr) {
        for (var i in new_arr) {
                this.pushUniqueVal(new_arr[i]);
        }
}
Array.prototype.swapItems=function(one,two) {
        var temp=this[one];
        this[one]=this[two];
        this[two]=temp;
}
Array.prototype.moveItem=function(from,to) {
        this.splice(to,0,this[from]);
        this.splice(from,1);
}
Array.prototype.getInd = function(value) {
        for (var i in this) {
                if (this[i] == value) {
                        return i;
                }
        }
};
Array.prototype.toString= function() {
        if (this.length==0) {
                var cnt=0;
                var typ="Indexed Array"
        } else {
                var typ="Ordered Array"
        }
        var listed = "";
        var addItm=function(i, itm) {
                //for XML nodes, dont print the whole thing, just the top node
                if (itm.hasChildNodes()) {
                        listed = listed + i + ":" + itm.cloneNode() + ",";
                } else {
                        listed = listed + i + ":" + itm + ",";
                }
        }
        if (typ=="Indexed Array") {
                for (var i in this) {
                        cnt++;
                        addItm(i, this[i])
                }
                var tot=cnt;
        } else {
                for (var i = 0;i<this.length;i++) {
                        addItm(i, this[i])
                }
                var tot=this.length;
        }
        listed = listed.substr(0,-1);
        return typ+" ("+tot+"): "+listed+")";
};
Array.prototype.remove = function(value) {
        var ind=this.getInd(value);
        //trace("REMOVE FROM: "+ind);
        if (isNaN(ind)) {
                this.removeByIndex(ind);
        } else {
                this.splice(ind,1);
        }
};
Array.prototype.removeByIndex = function(ind) {
        delete this[ind];
}
//returns total of filled slots for an array
Array.prototype.realLength = function() {
        var real = 0;
        for (var i in this) {
                if (this[i] != undefined) {
                        real++;
                }
        }
        //trace("realLength: "+real);
        return real;
};
Array.prototype.contains = function(obj) {
        for (var i in this) {
                if (this[i]==obj) return true;
        }
        return false;
};
Array.prototype.copy = function() {
        var new_arr = new Array();
        if (this.length == 0) {
                for (var i in this) {
                        new_arr[i] = this [i]
                }
        }
        for (var i=0; i<this.length; i++) {
                new_arr[i] = this[i]
        }
        return new_arr;
};
Array.prototype.clear = function() {
        for (var i in this) {
                this.splice(i,1);
        }
};
Array.prototype.sum = function() {
        var sum = 0;
        for (var i in this) {
                sum+=this[i];
        }
        return sum;
};