var caseStudies = ['intro','npf','dwvc','tsave','ids'];

function ShowCaseStudy( item ) {
	var lnkid;
	for (var i=0; i < caseStudies.length; i++) {
	   document.getElementById(caseStudies[i]).style.display = (caseStudies[i] == item) ? 'inline' : 'none';

     lnkid = caseStudies[i] + "lnk";
     if(document.getElementById(lnkid)) {
	     document.getElementById(lnkid).className = (caseStudies[i] == item) ? 'active' : 'inactive';
     }
	}
}