areas=new Array()
areas[0]="corporate"
areas[1]="litigation"
areas[2]="taxation"
areas[3]="realestate"

function hideAllExcept(elm) {
for (var i = 0; i < areas.length; i++) {
var layer = document.getElementById(areas[i]);
if (elm!= areas[i]) {
layer.style.display = "none";
}
else {
layer.style.display = "block";
}
}
}