kalizadeh, don't take any of this personally I am a webmaster and do this daily.... There are ALOT of errors with your page as far as coding goes it appears you used some sort of WYSIWYG editor (or the designing company you hired) your site has 283 Validation errors which is big time trouble for cross browser compatibility. (you can view this by using the W3 validator located at
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.keya4homes.com%2F) There is some placement issues with your site.. The picture in the top right is not flush. Your site is a bit too wide as well if you reduced it by just 50 pixels it would work fine (this is due to screen res)
Doug it should look the same in Firefox, IE, Opera, and all the other browsers as long as it's w3 compliant which would be all those errors that I put up top.
if anyone is curious here is a link where you can see what your site looks like in some of the other browsers
http://browsershots.org/ hope this helps