Replace Mapbender browser detection by jQuery browser detection

[christoph]

This is Mapbenders way of doing it

var ie = document.all?1:0;

var n6 = document.getElementById&&!document.all?1:0;

var n4 = document.layers?1:0;

We should use this

​http://docs.jquery.com/Utilities/jQuery.browser

[astrid_emde]

Ticket retargeted after milestone deleted