function showhidelayer(layername){
	if(document.getElementById(layername).style.display=='none'){
		document.getElementById(layername).style.display='block';
	}
	else{
		document.getElementById(layername).style.display='none'; 
	} 
}

//função para apagar o default text do text area... search

function clearDefault(el) {
  if (el.defaultValue==el.value) el.value = ""
}