468651 CSS or JS conflict on wordpress hotel booking engine widget

This problem exists only when viewed in IE7 or above My website is:- [login to view URL] and the eviivo booking engine widget (to the left of the page) wrongly displays the calendar when you click the calendar pop up. Internet explorer errors by displaying the text across the main body of the web page.(as shown in the attached image [login to view URL]) If you go and look at the website in Firefox then you will see how it should look.(as shown in the attached image - [login to view URL]) This project is to amend the code so that the calendar opens correctly in Internet Explorer 8 and ensure that the two below validation standards are maintained This document validates as CSS level 2.1 ! & This document was successfully checked as XHTML 1.0 Transitional! I will provide FTP details to the successful programmer.