Most web developers have lots of issues making their design cross-browser compatible. It's almost impossible to create a website which looks equal on IE6, IE7, Firefox and Chrome. And I'm not even talking about Mozilla, Opera and other browsers yet. A best practice nowadays is to create your website using a standards compliant browser like Firefox until your mock-up matches your design. Then fire up other non-compliant browsers and use specific stylesheets using Conditional Comments to fix the errors other browsers (like IE6 and IE7) create. And here lies your problem, because you cannot have IE6 and IE7 on the same desktop.read more ยป
