var myBio = new Array();
myBio [0]="b0";
myBio [1]="b1";
myBio [2]="b2";
myBio [3]="b3";
myBio [4]="b4";
myBio [5]="b5";

function showBio(layerID){
  for(var i=0;i<myBio.length;i++){
    if(myBio[i]==layerID && 
	document.getElementById(myBio[i]).style.display == 'none') 
	{
    document.getElementById(myBio[i]).style.display = "block";
    }else{
    document.getElementById(myBio[i]).style.display = "none";
  }
 }
}