function showlayers()
// takes an unspecified number of arguments which correspond to layer IDs and makes those layers visible.
{
	var showArgs = showlayers.arguments;
   for (i=0; i<(showArgs.length); i++)
   {
   	if (document.layers) eval('document.layers["'+showArgs[i] + '"].visibility="visible"')
   	else if (document.all) eval('document.all["'+showArgs[i]+'"].style.visibility="visible"')
	}
}

function hidelayers()
// takes an unspecified number of arguments which correspond to layer IDs and makes those layers invisible.
{
	var hideArgs = hidelayers.arguments;
	for (i=0; i< (hideArgs.length); i++)
	{
		if (document.layers) eval('document.layers["'+hideArgs[i]+'"].visibility="hidden"')
		else if (document.all) eval('document.all["'+hideArgs[i]+'"].style.visibility="hidden"')
	}
}