var H4 = document.getElementsByClassName("selected"), act;

​

    [].forEach.call(H4, function(el){

        el.addEventListener("click", function(){

           if(act) act.classList.remove("active");

           return (this.classList.toggle("active"), act=this);

        });

    });

​

    var bioArray = [

        "Biology",

        ['Common Job Titles: Biological/Lab Technician',' Medical and Health Services Manager',' Genetic Counselor'],

        "Skills in Demand: Relevant Certifications and Degree Programs Required",

        "Major Salary Range: $35,000 to $120,000 +",

        "Occupation Salary Range: Select a Job Title",

        "Average Salary: Select a Job Title"

    ];

        document.getElementById("bio").onclick=function() {

        document.getElementById("majorRep").innerHTML = bioArray[0];

        document.getElementById("jobs").innerHTML = bioArray[1];

        document.getElementById("skills").innerHTML = bioArray[2];

        document.getElementById("salaryRange").innerHTML = bioArray[3];

        document.getElementById("salaryRangeOC").innerHTML = bioArray[4];

        document.getElementById("salaryAvg").innerHTML = bioArray[5];

    }

    var geneticCounselor = [

        "Occupation Salary Range: $45,000 to $90,000",

        "Average Salary: $57,000"

    ];