Mark-up Converter function

The project is for a simple JavaScript function to be integrated into an application that is already 90% complete. Due to a very serious family problem, I will not have the time over the coming week to finish the function, hence, why I am seeking some professional assistance. The application runs in a textarea, which resides in a form. Users click a button and the application will convert any html document into xhtml. The application is designed to convert one mark-up language to another in basic sense. The function to be designed must be developed within the confides of the current application. The function required is to ensure that converted mark-up tags are correctly nested when the application generates the converted mark-up and displays the output in the teatarea. This means that if there are multiple tags applying to something on a webpage you must make sure the tags are opened and closed in the correct order throughout the output file. The function must also check and ensure that opened tags are not missing they're counter-parts, closed tags. Good knowledge of xhtml and html is essential for this project. A full brief is readily available with everything you will need, including the files for the current application. This will be allocated to the developer as soon as. This function should take only a few hours for a professional developer and there is also a very good chance you will be called upon for further development of similar applications in the future if the job is completed to a good standard. Time and cost are important, budget is probably around $35, although open to discussion, whereas the function will need to be completed fairly quickly, although I don't expect it to take long to complete. I look forward to speaking with you… Kindest Regards, Pixelation