// JavaScript Document


function HideContent(d) {
document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
document.getElementById(d).style.display = "block";
}
function ReverseDisplay(d) {
if(document.getElementById(d).style.display == "none") { document.getElementById(d).style.display = "block"; }
else { document.getElementById(d).style.display = "none"; }
}


function ShowAllCourses(){

                //shows all elements with classname specified here
                var myGroup=new Array();
                myGroup =getElementsByClassName('course_info');
                for(var i=0;i<myGroup.length;i++){
                                                myGroup[i].style.display="block";
              }              
};

function HideAllCourses(){

                //hides all elements with classname specified here
                var myGroup=new Array();
                myGroup =getElementsByClassName('course_info');
                for(var i=0;i<myGroup.length;i++){
                                                myGroup[i].style.display="none";
                }              
};