For some reason the ie gradient filter that is being applied to the enhanced ui selects is being interfered with so it no longer produces the light gray to white gradient instead it looks to have some kind of dark blue gradient instead (I'm colour blind by the way). The form can be found here http://www.eandhbaxendale.com/online-enquiries/easi-joist-enquiry/
I only have access to IE9 so I can't say what is happening with the earlier versions. Any help with this would be appreciated, I have had a route around using the IE9 developer tools and the css panel but I can't figure out what is overriding the filter that is found under the following classes in forms.css
.gform_wrapper .chzn-container-single .chzn-single div
.gform_wrapper .chzn-container-single .chzn-single
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#EEE',endColorstr='#FFF',GradientType=0)