IE Window.location Not Redirecting

I'm working on a page that uses javascript very much. My problem is now
that i cannot redirect to another page in IE with window.location =<URL>;
This command gets executed (proofed with alert messages) but nothing
happens. FF acts like expected but i cant get it work in IE. What can be
the problem here?

here the code i use:

this.NodeSelected = function( node ) {
if ( node.Value != null && node.Value != "" ) {
window.location = node.Value;
}
}