Problem displaying website in Firefox

If your webpage is designed-coded to fit in IE6 specifications then the problem is clear. IE6 doesn't comply with W3C specifications and so programming a site to make it work well on this browser means that it will display horribly almost in every other browser (at least in W3C compliant ones).

You will need to code specific CSS stylesheets for other browsers different than IE6 and, maybe, even redesign your site.

I have to agree with Bardobrave's comment.  NEVER EVER code for a legacy browser first unless you have a very specific audience/reason to do so.  Always code with compliance and validation in mind.  You should code for the modern browsers first, then test backwards to the non-compliant browsers.  

Start with FF, IE 8/9, Safari and Chrome, then work your way back to IE 8, 7 & 6 if necessary.

You should also start with some type of CSS reset to level the playing field with browser defaults.
http://meyerweb.com/eric/tools/css/reset/ 

ok but the problem is that the site existed before IE7 so everything whas made for IE6

Anything I can do?

1st things first, remove the meta tag that is emulating IE 7

<meta content="IE=EmulateIE7" http-equiv="X-UA-Compatible">

Let's see where that puts us

Old sites with old problems :)

Start doing what LZ1 suggest and we'll try to help you recompose the result if needed.

new website