function getObj(name, nest) 
 { if (document.getElementById)
 { return document.getElementById(name).style; }
 else if (document.all){ return document.all[name].style; }
 else if (document.layers){ if (nest != ''){ return eval('document.'+nest+'.document.layers["'+name+'"]'); } }
 else{ return document.layers[name]; } } 

function showLayer(layerName, nest)
{ var x = getObj(layerName, nest); x.display = "block"; } 
function hideLayer(layerName, nest){ var x = getObj(layerName, nest); x.display = "none"; }