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Thanks for your reply in advance
It isn't that your customer doesn't have the money to support multiple browsers. Your customer spent too much money trying to be fancy, and didn't want to spend any more to fix their mistake. Making compatible sites is easier and cheaper than it is to make a browser specific site.
due to the poor finance he could not make a site multiple browser compatible
A real false economy, as you can see. Even if it were true that a site that functions well in different browsers costs more than an IE-only site (and this is unproven at best), the fact that you need your site to function for the spiders - which are another kind of "browser" or user agent - in order to be successful should help your client reconsider his priorities.