function switchstaff(div) {
var option=['staff1','staff2','staff3','staff4','staff5','staff6','staff7','staff8','staff9','staff10','staff11','staff12','staff13','staff14'];
for(var i=0; i<option.length; i++) {
if (document.getElementById(option[i])) {
obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div)? "block" : "none";
}
}
}

window.onload=function () {switchstaff('staff1');}