var numberoflayers = 3

function showorhide1(passedlayer)
{
for (n=0;n<numberoflayers;n++)
{
layername="div" + n;
if(document.layers){document.layers[layername].visibility='hide';}
if(document.all){document.all[layername].style.visibility='hidden';}
if(!document.all && document.getElementById){document.getElementById(layername).style.visibility='hidden';}
}

layername=passedlayer;
if(document.layers){document.layers[layername].visibility='show';}
if(document.all){document.all[layername].style.visibility='visible';}
if(!document.all && document.getElementById){document.getElementById(layername).style.visibility='visible';}
} 

function hide2(passedlayer)
{

layername="div" + 0;
if(document.layers){document.layers[layername].visibility='show';}
if(document.all){document.all[layername].style.visibility='visible';}
if(!document.all && document.getElementById){document.getElementById(layername).style.visibility='visible';}

layername=passedlayer;
if(document.layers){document.layers[layername].visibility='hide';}
if(document.all){document.all[layername].style.visibility='hidden';}
if(!document.all && document.getElementById){document.getElementById(layername).style.visibility='hidden';}
}