"window.open" not works with NS and Opera

On my site I have the next script:

function open(file,name,features){window.open(file,'Show','width=400, height=400, toolbars=no, status=no, scrolling=no');}

To call this function I use the next code:

onclick=open('page.htm')

All this work good with IE but with NS and Opera open the full screen window.
What's wrong?

I have fixed with Netscape but it seems that Opera browser dont recognize width and height arguments at all.
Please confirm, if someone know about this.