function showOrHide(WindowName,TabName)
{
 tab=document.getElementById(TabName);
 box=document.getElementById(WindowName);
 
 tab1=document.getElementById('tab_1');
 tab2=document.getElementById('tab_2');
  tab1.className=''
  tab2.className=''
  tab.className='tab_active';
 
 box1=document.getElementById('content_tab_1');
 box2=document.getElementById('content_tab_2');
  box1.style.visibility='hidden'; box1.style.display='none';
  box2.style.visibility='hidden'; box2.style.display='none';
  box.style.visibility='visible'; box.style.display='block';
 return false;
} 
function displayOrNoneDiv(div_id)
	{
	var box=document.getElementById(div_id);
	if(box.style.display=='block')
	box.style.display='none';
	else
	box.style.display='block';
	}