function switch1(div) {
var option=['panel-one','panel-two','panel-three','panel-four', 'panel-five', 'panel-six', 'panel-seven'];
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 () {switch1('panel-one');}