I have 2 web sites build on VS.NET 2005 with Vb.NET and ASP.NET 2.0 and using AJAX. Both sites use client side javascript  to open DIV frames for user data entry and for other purposes too.

Both sites work perfect in IE5, IE6 and IE7 but it has started failing in IE8 and it doesnt work totallty corret in Firefox, Safari or Chrome.

Most failures are in the client side javascript (such as whe opening DIV frames or when using XMLHTTP client side object or when using styles)

I need an expert and experienced programmer that knows how to make these 2 web sites build W3C compliant and make them work in at least: firefox, IE5,6,7,8, Chrome and Safari)

Both sites are pretty similiar a share about 90% of the same javascript code 

This is an urgent requirement.