IE vs Firefox issue

I don't know what is it I did, but I modified a lot of my zencart website both in admin mode and changing the php scripts, but I was using Firefox to do this the whole time. Now I realise that when the website is viewed in IE7, the font size is massive. Here's a screenshot:

there is also a small error box showing an undisplayable image that links back to the home page - I have no idea what that is and it is not there when viewed in Firefox. Here's a screenshot of the exact same website in Firefox:

Can anyone suggest what the problem is?

When you can see the image with the red cross right click on it and click properties. Find out the file name, upload the file that it is looking for into that location (likely a spacer gif or something).

The same thing is happening in firefox and IE, its just that IE shows the image as missing with the red cross while firefox does not. :)

There may be an issue that needs fixing in your css, but for now this is the easiest, quickest, and most probable fix to use :)

Thx well I fixed the missing image issue, but the main problem here is the text size... I went into stylesheet.css and noticed that the font size is set to 65%, when i set that to 12 firefox displays it as size 12 and IE still displays it as massive size... so somehow somewhere IE is picking up a script that's magnifying the text size... Btw both browsers have text size set to medium (normal in Firefox)