That first link,
leumit.co.il is loaded up with vbscript. I don't know if any browsers other that IE undersand vbscript, but I doubt it.
The second link,
www.issta.co.il/flights/default.aspx has lots of XML with "xmlns:msxsl="urn:schemas-microsoft-com:xslt". I think the rules of XML say you need to give a URL so namespace schemas can be downloaded as needed, but I didn't see any URL for msxsl.
Yeah. I'd say both of those are very unfriendly, IE-only links.
If you really must go to those sites from Linux, install
IEs4Linux. I brought them up in IE6 (on Mandriva Linux) this way and they seemed to function normally (as far as I can tell without reading Hebrew).