Array Sort Problem

programming flash
1

hello, i’v got this sorting problem with arrays


var ar1:Array = new Array("345","300","450","70","200","100","125");
var ar2:Array = ar1;

trace(ar1); // returns 345,300,450,70,200,100,125

ar2.sort(Array.NUMERIC);

trace(ar1); // returns 70,100,125,200,300,345,450
trace(ar2); // returns 70,100,125,200,300,345,450

why it sorts both of arrays?
i need to sort only ar2? how it could be done?