We have recently launched our own PSD to XHTML service, namely, RapidConvert. We have over 10 years of experience and have converted over thousands of pages into valid XHTML/CSS. We strongly believe in web standards. All of our websites are coded using standards compliant HTML/XHTML and CSS. For sites that need dynamic interactivity we use JavaScript and AJAX. And for larger, more complex projects requiring database functionality we use MySQL with PHP or ASP.NET with MS-SQL Server.
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