function show(zap) 
{
   if (document.getElementById) 
	{
	 abra = document.getElementById(zap).style;
		abra.display= "block";
		
	} 		
}
function hide(zap)
{
   if (document.getElementById) 
	{
	var abra = document.getElementById(zap).style;
	  if (abra.display == "block") 
		{
		abra.display = "none";
		} 	
	} 
}