var pre,post;
if(document.layers){pre='document.'; post='';}
if(document.getElementById){pre='document.getElementById("'; post='").style';}
if(document.all){pre='document.all.'; post='.style';}
var currLayer  = 'initLayer';
function hideLayer(currLayer){eval(pre + currLayer + post).display='none';}
function showLayer(newLayer){
	if(eval(pre + newLayer + post).display != 'none') eval(pre + newLayer + post).display = 'none';
	else(eval(pre + newLayer + post).display = '');
}