Jeni's Musings

Some points: you write new Array, then only use named properties. That’s not an array at all, it’s just a hashmap. If you really had to write it the way you did, the appropriate incantation would be new Object. But I’d write it in a simpler way instead:

var limits = {
    safari:   defaultLimit;
    opera:    defaultLimit;
    firefox:  defaultLimit;
    netscape: defaultLimit;
    msie:     defaultLimit;
};

As for your actual point (“copy-paste coding sucks”): right on. To put it in Mark-Jason Dominus’ immortal words:

#11911 You wrote the same thing twice here. The cardinal rule of programming is that you never ever write the same thing twice.