function showhide(element, action){
if (!action) { action='swap'; } 
if (action=='hide') {
   document.getElementById(element).style.display ='none';
}
if (action=='show'){
  document.getElementById(element).style.display ='';
}
 if (action=='swap'){
  if(document.getElementById(element).style.display != 'none'){
		document.getElementById(element).style.display ='none';
	}
    	else{
 		document.getElementById(element).style.display ='';
    	}
    }
}