This problem only occurs in IE from my testing. It looks like a low z-index issue for the drop down DIVs themselves I believe. Inside dropdown.css/ dropdown2.css, change both of the line in red below to a higher z-index value:
See if that helps. BTW, in Firefox, your top chrome menu's drop downs are hidden behind the Flash display below it. Inside chrome.js, try removing the part in red below to enable the IFRAME shim technique for all browsers to see if that fixes the issue in FF:
Code:
if (window.createPopup && !window.XmlHttpRequest &&!this.iframeshimadded){
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