/**
* adds a cookie called "CaseStudySpecialtyPreferred" with value of a specialtyId which expires in 25 years. This cookie
* will be used to when creating a Featured Case Studies in the left column; if this value is present, Case Study
* selection will be filtered for this specialtyId.
**/
function setSpecialtyCookie( specialtyId ){
    var expYear = new Date();
    expYear.setFullYear( expYear.getFullYear() + 25 );
    document.cookie = "CaseStudySpecialtyPreferred="+specialtyId+";path=/;expires=" + expYear.toGMTString();
}